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Is Compost Tea Just a Fad?

One of our readers recently pointed me in the direction of a rather interesting article on the Fine Gardening (magazine) website entitled, “The Jury is Still Out on Compost Tea“.

I have little doubt that the article has touched a nerve with many serious compost tea proponents, since it essentially questions the value of using teas for various gardening applications (strangely they don’t have a comments section after the article – would certainly be a great opportunity for an interesting discussion).

I must admit to feeling a wee bit defensive myself when I first read it, even though I’m not really a compost tea advocate (simply haven’t used it enough myself). While I certainly don’t doubt that the “jury is still out” as far as more research being needed etc, and while I have little doubt that there are some people making exaggerated or even completely false claims – I just can’t help but feel that the author is potentially tossing out the baby with the bath water.

Here is an interesting blurb from the article:

Before you start using compost tea by the gallon, be aware that most of the claims made concerning this liquid have been anecdotal and, even then, inconsistent. The positive results from scientific studies have been few and, again, lacking in results meaningful to backyard gardeners. A documented benefit created under sterile conditions, for example, does not translate to a benefit in your backyard, with its slew of natural microorganisms.

Again, I certainly agree that there are lots of wild (and often unsubstantiated) claims out there re: the value of various types of compost teas (including vermicompost teas, of course), but the inner science-guy in me doesn’t mind keeping an open mind about some of the “anecdotal” positive feedback I’ve received from a lot of people. Take my good friend, Mike “Strawberry Guy” Wellik, for instance (certainly looking forward to seeing what you have to say about all this, Mike!) – he is a very science-minded, rational individual (with academic training in entomology, if I’m not mistaken), and has determined via testing in his strawberry business that vermicompost tea applications can be very beneficial! His results aren’t published in the academic literature, but you know what – I’m inclined to take his word for it!

BTW – be sure to check out Mike’s recent YouTube video: Brewing and Using Vermicompost Tea

Dr. Clive Edwards, who was originally rather skeptical of compost teas (as stated in a “Castings Call” interview with Peter Bogdanov – will track down the specifics on that one), has even changed his tune in recent years, based on the promising findings of various research projects conducted by his team at The Ohio State University Soil Ecology Lab. He went so far as to refer to vermicompost teas as “almost magic” in an email he sent me, referring specifically to the success he had growing a prolific crop of cherry tomatoes in his own garden (uh-oh! Anecdotal results alert!! haha). This is an incredibly-accomplished (hundreds of academic publications to his name), “old school” scientist we’re talking about here!

I guess my main point here is that, even if we ignore all the promising (if nothing else) academic research results, I just don’t think we can say that ALL non-scientifically-proven claims should be ignored. Based on all that I have read – academic or otherwise – my gut feeling is that there is DEFINITELY some value in using compost teas!

Obviously, as is the case with “castings”, “compost”, “vermicompost” – we need some sort of firm definition of what exactly “compost tea” is. Not all teas are created equal, that’s for sure! Just because a certain type of tea produces a given set of results in a scientific study does not necessarily mean that another type of tea (or even the exact same tea) will produce the same results in the “real world” – so I guess, on that level, the author and I can agree. I simply feel that there is enough evidence (academic and anecdotal) to warrant a more optimistic view!

But hey – to each his/her own, right?

Anyway – I would LOVE to see what people have to say about this! MY comments section is open for business!

Written by Bentley on January 13th, 2011 with 92 comments.
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#1. January 13th, 2011, at 6:39 PM.

an organic is so much better than a chemical ‘health drink’, ask the plants… they might not ‘shoot up to the sky in 5 mins’ but over all are much more healthy, a healthy happy veggie is a ‘good thing’ ;) i don’t really care about the ‘findings’, i just know my garden grows well with compost teas and other ‘health boosting methods…..

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#2. January 13th, 2011, at 6:43 PM.

How can breeding and applying beneficial microorganisms to your garden or crops be a fad? Sure, some people will have more success than others, some will stick to it, some won’t.

Discount all the wild claims, listen to those who had limited success. If you take the middle position between these 2 ends of the spectrum we are better off than we were before.

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#3. January 13th, 2011, at 7:13 PM.

If you collect enough “anecdotal evidence” that yields consistant results it would seem to me that the anecdotal evidence become empirical in nature. A simple experiment with a number of plants in identical containers and media, some fed with compost tea and a like number as a control group fed just water, should be enough evidence to convince any individual conducting the experiment whether or not compost tea is worth the effort (at least for that particular species of plant).

Get your own gravatar by visiting Mike Green
#4. January 13th, 2011, at 7:20 PM.

This last growing season I preformed a test where I left one third of my tomatoes with out any fertilizer, one third with miracle grow vegi fertilizer, and one third vermi treatments of castings and tea. All received the same water and sun. The results were pretty much as I figured…the plants with out any help were very small and struggled most of the summer(till I gave in and started giving them a booster) The miracle grow plants were jungle like and the vermi plants were somewhere in between. None of the plants showed any increased resistance to a late blight breakout I had, and all the fruit tasted pretty much the same. All that being said I still keep the worms working , and will still add it to my gardens, as I found it does not hurt anything and seems to be better then nothing. Besides the kids have come to love them and they make a great point of conversation.

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#5. January 13th, 2011, at 8:18 PM.

Hello Bentley, thank you for sharing. This topic has been on the back of my head since the 10th annual vermiculture conference @NCSU and yesterday I removed from my website what we call in Guatemala “liquid fertilizer”. No one in Guatemala, involved in vermiculture, has scientific data about compost tea. I believe a critical issue we could use to judge compost tea is its life spam. If the microorganisms can only live for 1 day in a recipient, then there is no point on producing it for the market. I was shocked at the conference when I heard “Its better than water”…
worm regards from Guatemala.

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#6. January 13th, 2011, at 8:26 PM.

Linda Chalker-Scott and Elaine R Ingham are two huge names in the discussion of compost teas. They have very different views on the subject and both raise some great points. If you are just getting into brewing compost teas I suggest you read what both of them have to say.

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#7. January 13th, 2011, at 9:11 PM.

Im still going to give it a try.

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#8. January 13th, 2011, at 9:51 PM.

Get your own gravatar by visiting Larry D.
#9. January 13th, 2011, at 10:13 PM.

I just know,i have never been a green thumb.But when i started using vermicompost tea,it made it greener.One knowledgable person told me that people make the mistake of spraying the tops of their leaves,when you should be spraying the underside.
Maybe the results are in my mind.But i will keep using it until it quits making me think it works.I’ve seen results first hand.No way i’m ever stopping making it!
When you are multiplying microbes,fungae,etc.,how can this not be beneficial to plants?

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#10. January 13th, 2011, at 10:31 PM.

My thoughts are that if the compost tea is put in a healthy microbial soil then the plant will temporarily be helped. The microbes from the tea that die will release there nutrients into the soil. Then the microbes that are already in the soil will lockup most of the nutrients til the plant needs them. I believe in poorer soils, lacking microbial structure the impact of tea will be greater.

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#11. January 13th, 2011, at 10:32 PM.

Bentley is absolutely right and so are all of you. I haven’t even read what “Fine Gardening” said in total and my blood starts boiling. I have said a lot already about brewing vermicompost tea and believe it is a part of future commercial production of what we eat. The world cannot sustain the path we’re on and soon we won’t be able to afford to be on that path. Food prices will continue to skyrocket due to the ever increasing prices of the inputs.

One consolation might be that “Fine Gardening” may not have the reach that it once did. I have personal experience with this. About 20 years ago I placed a classified ad with them to sell my plants. I received a LOT of responses, and they trickled in over a couple of years after the ad was run. Two years ago I ran a similar ad in their magazine and didn’t get a single response. My online advertising produces now what print advertising did 20 years ago. And, I might add, online advertising is much cheaper!!

My conclusion is that the “mainstream media” so to speak in gardening and other disciplines is no longer print publications. It is the Internet. Case in point, the video I did about brewing vc tea has been viewed 529 times in short order, in large part due to Bentley posting it.

One last point. I do agree that there is little practical data out there. Most is laboratory type of data which is where many studies begin. I think it is time to move it to the field and get hard data on the value of vc tea and compost tea. Unfortunately, to do it right it takes a lot of money. Replicated trials backed up with and correlated to laboratory analysis of the tea itself. Then, complicated statistical analysis and some sort of peer review to validate results.

There is only one commercial operation that I know of that uses vc tea commercially on a mind boggling scale – in 1,000 gallon batches. Here’s a link:

They are calling what they brew “Garden Espresso”. It’s vermicompost tea being injected into the irrigation system in a 4 acre greenhouse operation. Perhaps “Fine Gardening” should have done more research before making their statements? Truth be known, I think there are others out there doing something similar but keeping it under their hats for competitive reasons.

In my business I get more questions than I care to deal with from the public who wants and somehow expects to get information for free, especially productivity (yield) data. I have to tell them that I am not the extension service with public funding. Conducting such studies have value to me in my business but when released gives my competition the information for free. It’s a dilemma I am still trying to find answers to.

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#12. January 13th, 2011, at 10:49 PM.

The jury (my family , friends and neighbors) already deliberated in my case and the vote was unanimous: Compost Tea is Guilty of growing huge healthy fruits and vegetables, detering bad bugs, attracting good bugs AND making all your fertilizer using neighbors switch over to the wonders of worm tea. Sentencing: must provide worm bin owner with unlimited supply of this liquid gold as she sees fit.

Ahh, that was fun,

Get your own gravatar by visiting John
#13. January 13th, 2011, at 11:11 PM.

I agree with both you and the author you quote. Both scientific inquiry and anecdotal experience are important. It is also important to remember that a scientist in one domain/field does not mean that same person approaches all things in life with the same scientific rigor.

Anecdotal experience can provide a starting point for scientific inquiry. The strength (and limitation) of science is that it is very specific. A scientist would need to design hundreds of experiments to test all the different variations of compost tea out there. Also, scientists are usually interested in finding out why something works so that they can generate general principles. Casual gardeners, on the other hand, are more likely to just want to know does it work or not? That may not be easy to answer, especially when the answer is “sometimes” or “it depends”.

The best solution is for scientists and enthusiasts to work together, each bringing their own strengths to answer important questions about this topic. The enthusiasts probably want to know the best procedures to use to get the best results. Scientists will also want that information so they can take it a bit further and learn why these procedures produce these results. Enthusiasts can help the scientists to know what may or may not be fruitful avenues of investigation based on their experiences.

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#14. January 13th, 2011, at 11:31 PM.

This reminds me of the arguments I see between proponents of herbal/alternative medicine and medical doctors. Going to either extreme is not good. I’ve seen “alternative medicine” cures including drinking one’s own urine and people that claim anything that is “natural” is healthy (very untrue…think toxic mushrooms). Similarly I’ve seen doctors completely discount anything related to alternative medicine claiming it to be untested and non scientific. (The funny thing is that much of Western medicine isn’t actually scientifically tested either.) I find these extremes of thought to be generally wrong-minded and non-productive for learning more about our world.

In my opinion, the best results come from having an open, but scientific mind. Be observant. Approach one’s composting methodically, trying to make sure that all remains the same except the variables being tested. Keep notes. Share your results with the community.

Personal experience and scientific research are different kinds of experiences and knowledge because they have different purposes. However, they do have areas of overlap and can work together to enhance our general understanding of phenomena. It is more productive to focus on what they share and how to facilitate that middle ground than for either side to point out the supposed weaknesses of the other.

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#15. January 14th, 2011, at 1:02 AM.

I’ve had some bad experiences with compost tea and will never be using it on my decorative indoor plants again. However, I’m inclined to believe the anecdotal evidence concerning vegetable & general outdoor gardening: the stuff seems to work like magic! I think that people run into problems when they think worm tea will be THE solution to their fertilization problems when the true answer is always multi-faceted and holistic. It’s not a silver bullet, but a (large?) piece of a gardener’s fertilizational arsenal. :)

Get your own gravatar by visiting Mark from Roswell
#16. January 14th, 2011, at 2:21 AM.

A few comments I could add:

1. I have diverted 100′s of pounds of waste from the landfill (thanks worms)
2. I use NO synthetic fertilizer
3. Stuff grows like crazy
4. If we believe soil is alive anything we do to help it is a good thing, right?
5. Magic? Why not. Better than spending money on more synthetic chemicals

Get your own gravatar by visiting Mark from Kansas
#17. January 14th, 2011, at 2:52 AM.

I’ve tried the tea a few times using a control and didn’t have a real result however, I do know some credible vermicomposters that have. I just figured I was doing something wrong. I did notice that the VC tea never HARMED my plants.
Heather, what do you think? :)

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#18. January 14th, 2011, at 12:22 PM.

This is the bacteria 5 hours into brewing ->

This is the bacteria 24 hours after brewing

I bought a microscope and camera to know what the results are. It is amazing the level of bacteria activity after brewing.

I have been reading “Adding Biology” by Elaine R. Inghram For Soil and Hydroponic Systems. Still learning about this and learning but it makes sense to me that if you increase the diversity of bacteria population that the bad bugs will not have food to eat, or will have too much competition.

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#19. January 14th, 2011, at 3:33 PM.

Just to be clear about the Fine Gardening article (which I edited): The message isn’t that compost teas don’t work so you should use synthetics. It is that because many of the benefits of compost tea haven’t been verified by research, and you get all of those benefits by using compost (which you are making anyway), you might as well just use compost instead of going through all the effort to make compost tea.

A better title might have been “Is Compost Tea better than Compost?” or “Is Compost Tea Worth the Effort?”

The author of the article is Lee Reich, a soil scientist and organic gardener.

Get your own gravatar by visiting Bentley
#20. January 14th, 2011, at 5:32 PM.

Wow – great discussion, everyone!

Mike – thanks for chiming in and sharing your thoughts!
John – Awesome contribution – very well put!
Steve – I really appreciate you popping by! While I certainly didn’t think Lee was promoting inorganic fertilizers in any way, some may have interpreted the article that way – so thanks for clearing that up.
I agree re: the article title, although I’ll still keep my optimism about compost tea being valuable for certain applications where compost use is not really a viable or convenient option! (also don’t think it needs to be an either/or argument in general)

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#21. January 14th, 2011, at 5:49 PM.

I think Mr. Aitken may not have edited the whole article, or missed the last paragraph that states something about using tea in comparison to bringing coal to newcastle. If that isn’t a message that states “compost teas don’t work”, I’m not sure what else would. Also in that last paragraph the author states that the studies aren’t in. So the author wants you not to use something that has not been studied. We must all now throw out mom’s recepie book, it has not yet been studied, no matter how many times you have had good results.

The author is a soil scientist, organic gardener, and someone that might want to consider writing a story about what is proven, and or about his own personal experience. Leave the supposition to the tabloids.

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#22. January 14th, 2011, at 7:05 PM.

“Bringining coal to Newcastle” doesn’t mean “compost teas don’t work.” One doesn’t bring coal to Newcastle because Newcastle already has plenty of coal and bringing more wouldn’t be worth the effort. The analogy is to emphasize that if one is using compost regularly, one doesn’t need to add compost tea: it just isn’t worth the effort.

The author doesn’t want you to not use compost teas. He feels that using compost is more effective, a better use of your time, and has benefits supported by scientific study (which, to him, would be “proven”). I don’t think he is guilty of supposition in any way.

If you would like to take this up with the author, I’m sure he can explain this better than I can. His website is

Get your own gravatar by visiting Steve from St Louis
#23. January 14th, 2011, at 7:24 PM.

The title of the article was “Is Compost Tea Just a Fad? not “Go compost, it’s your birthday” I guess that I thought the title had something to do with the content in the article. I think that you were correct above when you said

A better title might have been “Is Compost Tea better than Compost?” or “Is Compost Tea Worth the Effort?”

All this aside, I want to thank you for becoming involved in the discussion and for making your viewpoint known. I appreciate your taking your time and investing it in the community of composters (worm or not). I also appreciate from hearing an oposing point of view. It helps to other perspectives.

I did take it up with the author and he sent me links to other articles that were not very complimentary of compost tea. I love the sass.

Get your own gravatar by visiting Bentley
#24. January 14th, 2011, at 8:47 PM.

Hi Steve (St Louis),
MY article was “Is Compost Tea Just a Fad?” – but this was referring to Lee Reich’s question (in “The Jury is Still Out on Compost Tea” – the article I was writing about) of whether or not compost tea will “move beyond fad status”.

Anyway – glad you were able to reach Mr. Reich! (thanks Steve A. for providing the additional info)

Get your own gravatar by visiting Frank
#25. January 15th, 2011, at 1:41 AM.

Check out “The Compost Tea Brewing manual” 5th edition by

Dr. Elaine Ingham for some non ancedotal scientific studies / results.

There is an enormous range in what is called compost tea, and all along that spectrum one can find varying degrees of quality and helpfulness to plants. It is easy to make a compost tea; it is more difficult to consistantly make good compost tea that is teaming with beneficial microbial life. And, good compost tea can not be made without good compost; it has to start there. That is one reason I like VC so much. What comes out of the hind end of our little friends is consistantly rich in microbial life, and, therefore, can be the start of good compost tea. From the compost, the next step is brewing tea, and that is a completely different discussion. I will leave that for another time.

I recommend reading “Teaming with Microbes” by Lowenfels & Lewis then tackle Dr. Ingham’s manual. Then, revisit your ideas about compost tea. Whether you are for it or against it, teach yourself what is actually going on in a compost pile or worm bin, and then take another look at compost tea, and why it works when it’s made right.

It has been a facinating study for me, and eye opening, and I encourage everyone here to jump into the subject!

+Frank in Simpsonville

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#26. January 15th, 2011, at 1:49 AM.

My personal experience shows that people have a major interest in compost tea.

Somewhat embarrassing to admit: I have a picture on an online dating site that has me smiling with a batch of compost tea…I’ve received an insane amount of emails from girls asking how to make it, or saying they use it. I never thought my love of compost would attract the ladies!

ANYWAY. My first few batches I would now call “leachate”, as they were anaerobic and smelled like sewer water. If you use this stuff on your plants, you could definitely kill them or at least piss them off. However, it’s easy to get it aerobic again and there you have it.

So I would say there’s some room for error, but overall it’s pretty obvious to me that it works great.

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#27. January 15th, 2011, at 4:20 AM.

Way to go Tyler! Compost tea as a chick magnet! Who’da thought?

If I was still single, I might not even care how much good it did to my plants! :)

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#28. January 15th, 2011, at 1:32 PM.

A few things that should be noted.
Some people confuse leachate for compost tea.

Even as Mary Apelhof wrote.Some vc contains a higher concentration of salts from things like manure.Even scrap table food,that has been salted to taste.You pour a bunch of salty water on your plants,of course you will get bad results.It is not the vc teas fault,but the salts.Check for high concentrations.

You must clean the tea maker every time.Study how to make it.You also add things like kelp extract and fish hydrosylate to boost what it does.Plain vc is not modified as tea is.You can make specific batches that will make your plants superior to others.Mike Wellik would not be wise to tell folks his secrets.People in competition with you will ruin your hard work and use it against you!

When you put vc around your plants,and water it in.It is basically a watered down version of vc tea in my opinion any way!

And lastly.VC tea is a way of expanding the vc.Down the road,this will be a necessity for tomorrows crops! It is already being used this way for a fact.No doubt it will not be declining in use.Farmers down the road will find they will make more of a profit by using this method.And they can spray this fairly easily!

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#29. January 15th, 2011, at 1:37 PM.

I have see this in Utune people calling bin drippings compost tea. Even composting systems for sale advertise this as rich compost tea your plants will love.

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#30. January 15th, 2011, at 8:48 PM.

Great discussion! I agree with the overall theme of the posts here that the best way to developing effective compost extracts is having scientists and practitioners work together so that the empirical “anecdotal” evidence and the experimental evidence can inform and build on each other. This is a point I’ve been making in grower talks for almost 8 years now :-).

My work on non-aerated liquid vermicompost extracts is not out in the scientific literature yet (still writing!), but some of our main findings are in our publicly available grant report to the OFRF on our vermicompost outreach page.

Table 2. shows a comparison of plant macro and micro nutrients between our non-aerated vermicompost extract and a common conventional liquid fertilizer. Our extract also consistently suppressed Pythium damping off in laboratory tests, even a week or two after sitting around in a bucket in the lab. This longer shelf life (which Maria mentioned as an issue with commercialization) is a major difference between aerated and non-aerated extracts in my experience and observations in the lab, although I have not directly compared the two. We also looked at freeze drying the extract and re-constituting it, which worked very well and the reconstituted extract retained its ability to suppress Pythium.

I’ve chatted a lot with Mark Elzinga and his greenhouse manager Roger Rosenthal, the growers Michael mentions in his post. They use a combination of solid vermicompost and aerated liquid extracts of vermicompost for nutrient management in his commercial greenhouse.

An important point I think the author of the Fine Gardening article left out, is that having a liquid source of plant nutrients is pretty important for commercial (and I would argue home) organic greenhouse production. Compost is great as a potting media amendment, however if you add the amount you would need to get all of the plant nutrients you need, you could end up with a drainage issue. I actually taught a lab on this in the Intro Soil Science course at Cornell. Compost has a very high water holding capacity, but in designing a potting mix you need to balance water holding with good drainage otherwise your plants’ roots literally drown for lack of oxygen. Most commercial organic greenhouse producers I’ve spoken with use compost or vermicompost in their potting mix, then have to use an OMRI listed liquid amendment like fish emulsion to supplement nutrients over the life of the plant. Remember, in a greenhouse system every time you water, nutrients actually leach out of the potting mix. Fish emulsion works great, and even has some documented disease suppression abilities, but it smells pretty bad.

Even in the case of field soil crop production (i.e. not greenhouse), adding compost or vermicompost before planting is pretty easy, but the logistics of side-dressing with a solid material during the growing season can be more complicated. Having the ability to provide some of the plant-available nutrients and beneficial microbes found in compost or vermicompost directly through the irrigation system can be a benefit for some systems, but obviously so much more work is needed to scientifically document the benefits of what some growers are already doing.

And taking my scientist hat off…I got great results this summer keeping my hanging baskets of fuschias blooming consistently all season with home made non-aerated vermicompost extract!

It’s a really exciting time to be a scientist or a practitioner working with these materials. There is a lot of potential and so much left to be discovered! Can I also just say how much I enjoy the civility, curiosity and creativity of the redwormcomposting community of readers. I long ago stopped reading or posting on any compost tea groups because the level of discourse sank far below what I would characterize as civil!I’ll keep you all posted when my next papers come out.

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#31. January 15th, 2011, at 9:04 PM.

Allison! So great to have you pop by and share your thoughts!
I definitely agree re: the level of civility here. I don’t know if I’ve just lucked out, but I’ve always been impressed with how polite and respectful people are when they leave comments here. I thought this MIGHT be the topic that would change all that!

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#32. January 15th, 2011, at 11:16 PM.

I should state as Allison did about fish emulsions.Fish hydrosylate goes through a slightly different process.But it probably smells even worse than emulsions.But boy does it work! It is basically fish ground up,and put into a bottle after the fish markets have used the good parts of the fish.It contains scales,bones and all.
Also i found out about castings water retention.If you put solid vermicompost in a pot with a drip system,it tends to stop up,and quit draining.

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#33. January 16th, 2011, at 12:14 AM.

this is a freaking awesome discussion here… learning a lot. Thanks everyone!

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#34. January 16th, 2011, at 12:57 AM.

I agree with tyler. learning a lot form all the post.

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#35. January 17th, 2011, at 5:39 PM.

IMO- the ‘problem’ with worm tea is the same ‘problem’ with vermicompost. We expect the same results from all worm tea, when all worm tea is not the same. In fact, the vermicompost used to make the tea is different with each batch, so the tea has to be different. Because each worm system is fed differently, the results will vary, as they should.
My problem with vermicompost and worm tea is the claims made by the sellers. Vermicompost is a poor fertilizer, at best, with very low N-P-K. But because of the micro-organisms, the nutrients are more readily available to the plants. This is my observation and not the result of lab experiments. If the major fertilizer producers sold vermicompost or worm tea, funding would be available to the labs to document the results. With worms available to everyone and tea easy to produce, I really don’t see the ‘big’ boys funding this research that would actually be competition to their business. Wurmz iz e-z!

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#36. January 17th, 2011, at 7:10 PM.

Great subject; great responses!! Thanks for being the catalyst, Bentley.

A previous hyper-active post concerning drying of citrus peels included a comment with reference to “Teaming With Microbes,” Lowenfels & Lewis ( I obtained the book from my library and found it fascinating.

The book draws heavily from the work of Dr Elaine Ingram, also mentioned in this thread, and other Soil-Web scientists. I thank the previous poster for alerting me to the book and recommend it to all of you.

The book also emphasizes a point made by steamyb and others that all tea is not equal and that not every tea is suitable for every situation. Some teas are more bacterial and others more fungal. Each type has its place with bacterially dominant being more beneficial to veggies and fungally dominant to trees/shrubs.

One of the book points that makes great sense to me is that what is most important as far as nutrients go is what happens at the root-soil interface, the rhizosphere. A healthy soil-web system, the book posits, delivers what the plant calls for at this critical interface versus the system of inorganic fertilization which delivers its dose to the entire soil structure, a small percentage of which affects the rhizosphere, the balance of which leaches into the subsoil and beyond, out of play. Thus the relatively low level NPK in compost and compost teas are more effective than the high level NPK rates of inorganic fertilizers.

I hope I have not damaged anyone’s interest in the book by my weak interpretation of a small part of it. You owe it to yourselves to give it a read.

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#37. January 17th, 2011, at 8:12 PM.

Just a quick follow up on steamyb and John’s comments. Yes, there’s a high variability in compost and vermicompost extracts especially those made at home. However, the non-aerated vermicompost extract I helped develop with funding from the Organic Farming Research Foundation contained higher P & K than a synthetic 20-10-20 liquid fertilizer applied at a rate of 200 ppm. It also contained higher levels of micronutrients across the board when compared to a commonly used synthetic fertilizer. The only nutrient that was deficient was N, which could be supplied by other organic sources. These extracts are definitely a source of potentially beneficial microbes (and in our case consistently suppressed Pythium damping off), but don’t dismiss them so quickly as a good source of plant available nutrients!

I’m really excited to see more research in this area. The availability of vermicomposts produced under highly controlled conditions with a consistent feedstock means that large scale use of vermicompost extracts for organic greenhouse nutrient management is already happening…and as scientists we are struggling to keep up with and document the new practices being developed by progressive growers.

The neat thing about living in a democracy is that you, as taxpayers are funding a lot of research on organic agriculture through the USDA (thanks!) as well as non-profit research foundations like the OFRF. Organic agriculture isn’t as “fringe” in the research world as it used to be. Only 7% of university research is funded by industry (read that figure in Science magazine this morning at breakfast). This means the more citizens get involved in the political process, i.e. letting your senators know what kind of agricultural research you’d like to see prioritized in the 2012 Farm Bill, the more we can move in a more sustainable direction.

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#38. January 17th, 2011, at 9:56 PM.

I agree that all VC is not alike, for instance, I add alphafa pellets to my bin. I’m not sure about how much N I end up with but, 1 pound of it in my big bin sure heats up.

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#39. January 17th, 2011, at 10:42 PM.

Dear Alison,

You wrote:

“The availability of vermicomposts produced under highly controlled conditions with a consistent feedstock means that large scale use of vermicompost extracts for organic greenhouse nutrient management is already happening”

For me and what I ultimately hope to do , consistancy and control is where the rubber meets the road. I want to come up with a way to consistantly create a compost product rich in benefcials which is repeatable and scalable. In order to have any hope of commercial success, it can’t be otherwise; the product has to be “the same” everytime. It sounds like you are in the thick of that part of the vermiculture world, and it is a pleasure and privilege to read your responses here on this site! Thank you.


+Frank in Simpsonville

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#40. January 17th, 2011, at 10:48 PM.

I have to say that I find Allison’s report to be fascinating. One point that blew me away is that more is not always better. Her statements that higher numbers resulted in little or no suppression while lower number resulted in suppression is food for thought.

The non aerated vermitea also surprises me to some extent. It is worth comparing to the way I brew the vermitea.

I have been dealing with Pythium on strawberry seedlngs for a number of years. When I started using vermitea the problem all but went away. A number of other problems also became more manageable such as fungus gnats. I have also used vermitea on rare heirloom varieties that have NO disease resistance. Two years ago I used it on leaf scorch that was so bad that I thought I was going to lose my entire collection of a rare variety. After two applications of vermitea as a spray the plants started bouncing back and all survived.

The section with the different modes of action against Pythium are also very interesting. I purchased Bacillus subtillis (brand Cease) and Pseudomonas corrugata (I believe this is Actinovate) last spring. Using the former for foliar application and the latter as a soil drench. Disease was not an issue at all after a couple of applications. I’m still using vermitea and the above products alternately during highly infectious periods in the spring. I also am forced to use sprinkler irrigation which brings on a lot of disease, especially in late spring and fall. Having these products is complementary to the vermicompost in the soil mix and twice monthly applications of vermitea.

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#41. January 18th, 2011, at 12:39 AM.

Oops! Actinovate is Streptomyces lydicus. Not sure of it’s mode of action. Not sure if there’s a commercial product for Pseudomonas corrugata?

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#42. January 18th, 2011, at 10:42 PM.

I tend to agree with the late, great George Carlin and acknowledge that I’m not in the ‘Club’. As a citizen in this democracy, I don’t control squat. Whoever, if I were a lobbyist for a huge conglomerate agro-biz with tons of money, I could ‘buy’ all the politicians to support anything I wanted to research and let the citizens pay for it. As it is, I really don’t want the government regulating my worms poop or the ‘tea’. :)
One more thing- how do we know that the microbes are good anyway. I read that bad microbes can happen, too. ‘Biology of Earthworms’ Edwards,Lofty Chap.10 pg190-197
One more thing- all I have ever read said aerobic = good and anaerobic = bad; when did that rule change? I need a nap! :)
And yea, Worm Tea is a fad- I just finished building a 55 gallon tea machine.

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#43. January 19th, 2011, at 5:45 PM.

Well, I’ve been away for a week and look what happens! great job Bentley and redworm discussers! For my customers, I make AAVCT, for most of my purposes, I have used non-aerated, which I brew overnight. My results are:
1) like Allison and Mike–I did an experiment last spring with spinach and had a huge difference in germination and damping off in the tea group vs. the non tea group–HUGE!
2) has stopped powdery mildew overnight, restoring cucumber vine to health while neighboring garden plots died
3) Stopped brown patch fungus and allowed healthy grass to regrow into area. Neighbors who didn’t use it, still have the fungus
4) Neighbors had black spot fungus on bush leaves, kept spraying chemicals, didn’t work. Finally asked for worm tea–gone after 1 application
5) Much healthier plants than other neighboring garden plants. When other garden plots succumbed to blight, mine didn’t (until I went on 7 day vacation and it rained the whole time–came back and a few (but not all) tomato plants had it. Other gardeners’ tomato plants had been affected and died weeks before.

So, do I think VC tea is the only tool–no, I certainly utilize alfalfa meal (mixed with VC) as a natural plant hormone source/nitrogen source, add rock minerals in the spring or when planting potatoes, and continuously add compost and mulch my plots with leaf mold…but that is about it.

There is a wide degree of variation in quality of VC too. If you have newspaper and an occasional carrot thrown in your bin, because you are afraid of co-composters, smells or whatever (and there is worm composting training that promotes just that), there isn’t going to be as much value in the VC as when there is a variety of materials (well thought out) in your worm bin.

The last thing I’ll add–one of the biggest frustrations when helping people garden, use amendments, etc., is the individual’s ability to follow directions. So, if they have a problem following directions when something is “ready to use”, I certainly would be concerned when “direction challenged” individuals would make quality VC, and brew tea themselves.

Worm Tea on, I say!

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#44. January 20th, 2011, at 12:00 PM.

Bentley should have named this one”The truth about teas!” As Heather says,some people do not do well at directions.Most things i fly by the seat of my pants.VC tea is the exception. It is just like cooking though.No two people cook the same,follow the same protocol,etc.Things like having the tea maker spotless is important.Would you eat off of a dirty dish? You don’t just throw your tea equipment out in the yard and let the weather clean it for you.You need to follow strict standards.If someone was making synthetic fertilizer,they would not just pour in a bunch of junk.Why would someone do that with an organic solution? You will fail almost every time.Then tell everyone it doesn’t work,when it does!
I truly feel on this one,that if you don’t believe it works,i would not waste my time making it.Just like if you don’t really feel like cooking.The food is seldom good! Me,myself? I am making ten gallons today.My grass will surely be greener than my neighbors again this year.And i can skip doses too.They can’t!

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#45. January 20th, 2011, at 2:57 PM.

What is the best way to clean/sanitize the bucket and air hose after each use. It will be my first time making it this spring?

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#46. January 20th, 2011, at 4:00 PM.


Why such the fuss over cleaning out the 5 gallon bucket you are brewing compost tea in? After you have a clean bucket you are going to put compost dirt in it to brew the tea.

I mean what is in the bucket that is not in the compost?


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#47. January 20th, 2011, at 5:58 PM.

Wow – amazing discussion, everyone! (unfortunately haven’t had time to really dig through it all though).

Larry – I myself would likely be careful using the word “truth”, since I don’t know the actual truth about compost teas any more than the author of the article in question (or anyone else here for that matter). We’re all just reaching our own conclusions based on the evidence in front of us. In MY world, the evidence looks good, though! haha

I’ve always been really interested in the aerated vs non-aerated argument. Thanks very much for sharing your results, Allison (and others)! Interestingly enough, in “Vermiculture Technology” (recently discussed on the blog), Dr. Edwards writes:

“In preliminary research on vermicompost teas in our laboratory (OSU Soil Ecology Lab), we made the important discovery that teas that were actively aerated during production had much greater effects on plant disease suppression than those that were not. Aerated teas also performed much more consistently than non-aerated teas. Hence, for all of our experiments we standardized our vermicompost tea production to use only aerated vermicompost teas.”

(Quoted from: Chapter 14 – “Use of Aqueous Extracts From Vermicomposts”; p. 186)

Certainly not trying to suggest anything here (re: value of aerated teas etc) – well, other than the fact that there is still LOTS of work to be done in this field, I guess! haha

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#48. January 20th, 2011, at 7:31 PM.

I’d like to briefly weigh in regarding the aerated vs. non-aerated vermicompost extracts. This is a perfect example of why it’s helpful to have many different people with different perspectives working with these materials. I actually just read Norm and Clive’s chapter this morning. The lowest vermicompost to water ratio they tested was 5%. In my experience working with these materials (7 years), we found that anything over about 3% vermicompost : water (by volume) in a non-aerated extract burned the root hairs off of germinating cucumber seeds. That’s why we finally settled on a 1:60 ratio for our experiments, which is about 1.6% vermicompost : water (by volume).

The editors of the book invited me to include my results in my chapter, but I wasn’t willing to include anything that hasn’t yet appeared in a peer reviewed journal and been scientifically validated. But I’ll keep you all posted when the paper comes out! For now, these results are available to the public for grower outreach purposes in our OFRF grant report.

The starting ratio of vermicompost to water is a major factor in determining the performance of non-aerated extracts. Right now it is impossible to draw comparisons between experiments conducted in different labs because not only is the vermicompost used in making the extracts different, but the vermicompost : water ratios are different too. We shared our results with Clive and Norm in 2008, but to my knowledge they have not tested the lower ratios that we found to be effective.

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#49. January 20th, 2011, at 10:39 PM.

Yeah,i forgot to mention always use IMO.In my opinion.Actually we have had people quit forums over discussing it.It is the hairiest subject that has ever had to do with worms it seems!
Biofilm can affect the integrity of the tea from what i read.I’m certainly no scientist.But also if you don’t clean your tea maker,it is possible to breed e coli,salmonella,etc.Imagine breeding it every batch!
From early research i had saw where the gov. said no one had ever died from it to their knowledge.But if i am going to be putting it on the greens my family is going to be eating(some raw)you can bet i am not taking chances needlessly.That is worse than eating with dirty hands when you think about multiplying pathogens.
But just as Allison stated about an exact percentage for non aerated.Aerated is brewed to be fungal or bacterial.If you use dirty equipment you are probably never going to get the results you are looking for.You want to be as close to the same batch every time.Right down to if you do or don’t use molasses.Some folks are against using molasses too.So it is a preference type thing.This is why some peoples formulas are protected like treasure maps.No one can ever figure out your formula if you don’t tell them.
Paula,i use hydrogen peroxide and whole grapefruit.I wash the bucket with the juice and peel.Then i soak the air stones in hydrogen peroxide.After that i rinse it again! I clean air hoses and all!
I use kelp extract and some other stuff.But i quit using fish hydrosylate in the bucket.I put it in the soil instead.That stuff stinks to high heaven.You can wash the bucket 10 times and not get rid of the smell!

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#50. January 29th, 2011, at 12:55 AM.

The beauty of this discussion is that it points out many of the variables that come into play when trying to make a generic statement about compost tea.

All compost, and vermicompost is not created equally – and good luck trying to find a “uniform” starting material, especially if that is coming from our current “green” waste stream. Even if you use composted cow manure to feed your worms – I can guarantee that the biology in each batch will be slightly different based on a myriad of factors. What time of year it was when the cows were feeding, what were they eating, what drugs if any were they given, etc. Different feedstocks yield different results. What temperature, moisture content, oxygen content was in the compost – did any or all of it ever go anaerobic? What was in the water you used to moisten the compost? Now feed this compost to your worms, and the worms and millions of other microbes and fungi will continue to break it down into what we call vermicompost – the nutrient levels will vary based on the original starting materials and all the variables along the entire process. Now, let’s take that vermicompost and make an actively aerated compost tea (AACT). What type of brewer are you using(different brewers produce different results using the “same” starting materials, are you monitoring dissolved oxygen content during the entire brew cycle? How long are you brewing? Are you using a microscope to analyze which microbes and how many are present? Are you adding anything else to your brew? Now, let’s apply this to the crop. Yep, you guessed it – how you apply it makes a difference – some spray nozzles will kill all the biology, or a lot of it before it reaches the leaves or roots of the plant – you actually need a microscope to see what your brew looks like after it comes out of the applicator/spray nozzle. Could you compare your results to someone in a different lab using a different microscope and lab procedures? And then of course – what time of day are you applying it – what was the weather, temperature, and humidity? All these things make a difference! And of course what crop are you applying it to? A Blenheim apricot is going to have different needs than a romanesco broccoli. Now how is that tea going to react to your particular soil?

Okay, so there are a lot of variables – I’m a huge believer in the benefits of QUALITY compost, vermicompost, leachates, extracts, and teas – but trying to quantify the quality is the challenge. Dr. Ingham and Clive Edwards have done huge amounts of work in these areas, but the amount of things we don’t know about the interactions of chemistry and biology in the rhizosphere is staggering. We only know a small percentage of the actual microbes and fungi in the soil, and we don’t even know their actual function. Do we need to understand everything – NO! We have seen what happens when there is no biology in the soil, or only the kind that is detrimental to plant health. In broad generalities if we can get organic matter and biology back into the soil, soil structure improves, water retention improves, nutrient cycling comes back instead of leaching nutrients away, even compaction can be healed. And one of the best ways to do this is by using quality compost and vermicompost. Compost or vermicompost leachate or extract can help make the material go much further without the complexities of brewing – ultimately it helps get beneficial biology out in the soil. Anyone that is interested in learning more from Dr. Ingham should take one of her 5 Day seminars. If you want to go even further, take a Permaculture Design Course, and realize that is just the tip of the iceberg. If you care about this great big planet we call Earth, and all the life forms on it, try and do your little part to help make our way of life more regenerative, not just sustainable.


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#51. January 29th, 2011, at 1:22 AM.

From Linda Chalker-Scott – “I have a home landscape with many trees, shrubs, and groundcovers. I don’t use pesticides except for an occasional shot of Roundup; I don’t use fertilizers, unless I can determine a deficiency (most commonly nitrogen, which I add as fish meal only to plants that need it); I don’t add anything else to the landscape except wood chips as an organic mulch. I don’t have disease problems, I don’t have insect pests, I have a healthy, organic landscape. This tells me that compost tea is not crucial for landscape health. If a landscape has serious soil or plant health problems, it is not likely that compost tea is going to solve the problem.”

I find someone who uses an occasional shot of Round-up saying they have a healthy organic landscape a little disturbing coming from someone that bills themselves as the “informed gardener”.

Her problem with compost tea is that their isn’t enough “scientific” evidence to bother with it – and goes on to say it is better to just use the compost. For a home gardener maybe this is possible, but try and scale up the amount of compost needed for 1,000 acres and compost extract is much more economical. It won’t be as long lasting or as beneficial, but it is a start in the right direction – much better than going with genetically engineered seeds, chemical fertilizers, and Roundup – a deadly spiral.

By the way – did you hear that the USDA just approved genetically engineered alfalfa – Roundup Ready – our 4th largest crop in the US, 93% of which is grown with no herbicide. Now how fast until Monsanto’s genetically engineered crop pollinates eveyone elses alfalfa crops and Monsanto owns everyone again – they already did it with Canola.

Sorry – this is about Red Worm Composting – go worms, microbes, and fungi. They can’t make campaign contributions, so we have to help them!

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#52. January 29th, 2011, at 2:06 AM.

Thanks Don! You covered more than i could research in a month.
I will say that Monsanto is a dirty word in more than one discussion on the net! Someone lost a bottle of roundup out front of my property.I cringe thinking about walking in the dead patch of ground.I feed my worms weeds.Dandelions are a delicacy at my house!
Also about the statement on the spray nozzle pressure.It is also the pressure you pump up in some of those sprayers.It actually explodes microbes.Even certain pump systems used to make the tea are too strong.Or too much agitation.But it is fun learning all you can about this stuff.You can better your own brew.Who wants to buy a sack of fertilizer and kill all the microbes? Not me! I still want that doh meter and microscope for Christmas.Is it December yet?

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#53. January 29th, 2011, at 3:47 PM.

Don Smith wrote”
“Anyone that is interested in learning more from Dr. Ingham should take one of her 5 Day seminars. If you want to go even further, take a Permaculture Design Course, and realize that is just the tip of the iceberg.”

Wow, Don exceptional post! Thank you. I commented earlier in this post that it is easy to make compost tea but much more difficult to make good compost tea. You wonderfully layed out for us the many variables that go into compost, vermicompost, and compost tea, elaborating on what I said. There is no surprise that results vary! I am a huge fan of the Soil Food Web teaching and Dr.Ingham, and a goal for 2011 is to attend the 5-day you mentioned above.

I also liked your reference to Permaculture. So much to consider, but all fascinating.

+Frank in Simpsonville

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#54. January 29th, 2011, at 3:52 PM.


May I copy your 29 Jan post “The beauty of this discussion..” post on another site? People need to see and read this info.


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#55. January 29th, 2011, at 4:38 PM.

Frank – copy away – but I think you should link back to this website to give Bentley credit for hosting a great discussion, and it would be fair to mention my name, too. And you should provide the links to what Allison Jack is doing – did you read her paper? I personally think there are so many variables that it is almost impossible to figure out how the microbes are able to stop certain diseases – we always seem to try and find what is the one key element that makes something work, when it is often an extremely complex combination of interactions happening at a microscopic level – and how much does observing with a microscope disturb the activity? It is truly fascinating to realize how little we know. I certainly won’t let that stop me from using compost and vermicompost!

Larry, you are absolutely correct about pumps destroying biology, my brief diatribe did not come close to covering all the variables!

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#56. January 30th, 2011, at 10:30 PM.

Hi Don,

Thank you. I posted your post just now, giving Bentley the much deserved credit for starting such a great thread, as well as calling attention to Allison’s posts, too.

Have you visited Bentley’s Worm Farming Alliance site (that is where I copied your post)?

It’s focus is more on the business side of vermicomposting, and if you or anyone has sights on any kind of business endeavor it is shaping up to be a good group, and with Bentley’s content, it will be an excellent site.

+Frank in Simpsonville

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#57. February 8th, 2011, at 9:41 AM.

Having read David Murphy’s book “organic growing with worms” he does an experiment with tomato plants, with two sets of plants. One set was sprayed twice a week with enhanced vermicast solution the other was not sprayed. After 5 weeks the results were amazing. The tomatoes sprayed were almost double the size of the non sprayed. Photographs in book.

For any doubting Thomas get the book. The bacteria increase was also carried out by Collex Laboratories in South Australia in 2002. The jury must have been out a long time.

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#58. March 13th, 2011, at 7:37 PM.

We use, make, and analyze the results of compost tea and worm tea from our composting facility on a daily basis. Right now, in the middle of the cold March, we begin growing starter plants on racks through out our facility. All of these plants are watered with a diluted worm tea mixture and regular water and the results are amazing. We just collect the liquid run off from our 100 yard flow-through worm bin at our site. This “Worm Wine” is added to all our water of our plants and to our compost tea. Compost tea and worm tea is not a fad. However, the highest quality compost tea that is aerobically made in industrial compost tea brewers only has a shelf life of a couple hours. You have to use is quickly to get the full microbial burst to your plants. We are able to do this at our facility. For the backyard gardner, ANY TEA IS BETTER THEN NO TEA!

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#59. June 27th, 2011, at 5:53 AM.

there are many ways to skin a cat. we are not forced the choose between either chemicals, compost tea or nothing. we can choose a one or another or a combination or a multitude of other ways of improving soil. I wonder if anyone has tried a trial with a compost tea group, compost group, no fertilizer group? in some ways it seems more logical to just add the compost and get the nutrient and the organic matter and a slow release. plain old compost has tons of microbes to start with. all claims for compost tea that seem reasonable are the same claims you could reasonably make for pain old compost as far as I see it.
I plan of doing a trial of my own with a control group, its the only way to be reasonably sure that the results are not due to some other factor. while it may not hurt your soil but it may just be a huge waste of your time. but in some cases garden lore can hurt your results, just look at the actual results of pre soaking bean seeds before planting.

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#60. June 28th, 2011, at 8:13 PM.

@Nick: Funny you mentioned it… I just did an experiment growing basil in several different types of compost vs. no compost at all… and my next step is definitely to try using compost tea/worm tea vs. none.

Be sure to link your compost trial up here, I’d like to see what you come up with.

Is making compost tea a waste of time? It definitely takes longer to make it than to dump it out in the dirt…but it still is fun.

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#61. June 29th, 2011, at 11:04 AM.

Nick,just remember synthetic fertilizers kill microbes.If you mix the two,in my opinion,you would likely be better off to just forget about the organic.We,ve already seen several root growth experiments,in which there was amazing results.Always good to experiment though!
And as far as soaking beans.Don’t forget you get better results by using an innoculant on the bean seed.Sort of like what they say about using worm castings/vermicompost.

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#62. June 29th, 2011, at 2:40 PM.

Nick –

You are almost correct that the benefits of compost tea don’t seem to be any better than using plain old compost. See my post #50 – the main reason a farmer would use compost extract or compost tea has to do with the quantity of compost needed. It is generally much harder and more expensive for a farmer to acquire the tons of compost required to apply it directly to their fields, but it would be the preferred method. Compost will last much longer and provide more organic matter than an extract or tea ever could. According to research done by Dr. Elaine Ingham, teas should be reserved for foliar applications, since research showed no benefit when using teas directly on the soil versus using an extract. Why spend all the time and energy brewing if you can just use an extract? However it does make a difference in foliar applications. A well made tea is full of microbes and fungi, of which some will actually stick and survive on the leaf surface, providing a protective shield against bad guys. If your soil is very healthy and has everything that your particular crop requires, a foliar application would not be necessary, because insects are looking for stressed plants and pathogenic microbes would not be able to get a foothold – very similar to healthy people and germs. Some research shows that plants can take up nutrition through their foliage as well, which could mean that you might get even better results by applying tea and compost both.

In summary, if you can afford compost – that should be your number one choice. If you can’t acquire that much compost for your soil, then make an extract. If you would like the “potential” benefits of compost tea on your foliage, then go for it.

As for mixing fertilizers and compost – fertilizers and pesticides and herbicides can be used, but applications of compost, extract, and teas should follow later otherwise you are wasting money. Just remember that healthy ecosystems were abundant the world over without any pesticides, herbicides, or fertilizers. All the man-made chemicals we have been and are applying have and are causing a huge loss of extremely valuable topsoil, polluting river, lakes, streams, groundwater and oceans. The current popular method of farming destroys the nutrient AND water holding capacity of soils, because it kills the biology that is responsible for those functions.

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#63. June 29th, 2011, at 3:50 PM.

Not sure how much it matters?But a master gardener had me start using additives in there for a soil drench.Plain tea shows little growth on the ground.But add things to it,and you get a mold and fungi growth.He has been experimenting with tailored blends.Who knows how good it works? But i know as a soil drench it feeds the worms in the ground.And mold and fungi is an important part of plant growing.Surely a benefit to the plant also.Synthetics will just kill worms.He also said it is important to spray the underside of the leaves the compost tea.From the looks of his garden,he is doing something right!Just wish i was born a green thumb!Some of us need a lot of help.My results are just based on i grow stuff better than i used to! LOL!

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#64. July 2nd, 2011, at 8:26 PM.

For Don-

“If you can’t acquire that much compost for your soil, then make an extract.”

I think I missed something! What do you mean by an extract? Or is that another name for compost tea?



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#65. July 4th, 2011, at 11:15 PM.

@ Frank

In some circles, “tea” and “extract” are interchangeable. In others, “tea” has the added dimension of aeration and nourishment to enhance the multiplication of microbes present in the “extract.”


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#66. July 5th, 2011, at 5:50 AM.

Frank D.

In my circle, tea and extract are very different. The main difference is that tea is “brewed” to get the microbial population really high before applying it to the foliage. An extract is just putting your compost in a mesh bag, dropping it in the water and working it around to squeeze out as much biology and nutrients as possible in a short amount of time compared to many hours of brewing. You don’t need a fancy brewer, and can process many more gallons of extract in a day than you could if you had to brew each batch for 18-48 hours or more before applying it.

To add one more term to your vocabulary, try leachate. This is different than an extract or a tea, although some people think they are all the same. Leachate would be the runoff from a compost pile that is too wet, or a worm bin that is lacking enough bedding. Many of the worm bins have a little spigot at the bottom and they call the liquid that comes out “worm tea”, but is really not a “tea” or an “extract” – it is “leachate”. This liquid could be aerobic or anaerobic, and can be wonderful or not so wonderful. If your worm bin or the leachate smells bad, generally you are dealing with anaerobic conditions which are more likely to harbor microbes that you don’t necessarily want to be feeding to your soil. Or another way to think of this – if it smells, nutrients are leaving your compost that could be going into your soil.

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#67. July 9th, 2011, at 9:45 PM.

Here is a new compost tea information video from Craig Witt a soil scientist in Northern Nevada.

Good info on why compost tea is not a fad.

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#68. July 11th, 2011, at 6:46 AM.


Not to rain on your parade, but I believe that the term scientist is used somewhat loosely in your post. That video is filled with questionable claims and adulterated compost. Where is the science? I know of a well known lab that tested the compost mentioned in the video for an actual research project – and it was not considered high quality compost. What is he using to make his claim that the compost is “high quality”? I can show a plant that looks just as amazing using Miracle Gro (I don’t support that) – does that mean we shouldn’t use compost? I can also show plants that look just as healthy using high quality compost and vermicompost that has not been adulterated. I’m all for using high quality compost and brewing compost tea for foliar applications, but not for adding additional chemicals to the mix. His particular method of making “tea” for a foliar application is questionable as well. I didn’t see much science involved in that process.

Science would involve a control group with no compost, one with unadulterated compost, and one with adulterated compost from the same batch as the unadulterated one. Then showing that one consistently produced higher yields with more nutrition(an expensive test), and that your soil was actually improved, both biologically and chemically(more expensive testing). I have no idea what type of medium the tomato plant that he is showing is actually growing in – what would it look like without the treatment?

People get different results with teas for many reasons as I elaborated many posts ago. How does the average person know that they are getting a high quality compost? What metrics are you measuring to consider it “high quality”? Well made actively aerated compost tea has been shown to work in scientific literature. Compost tea has also been shown to produce E. coli in scientific literature. It was not well made compost or tea, yet they “proved” that tea was dangerous!

I encourage people to get more information about the benefits of vermicomposting, learn about Permaculture, etc. And question someone that is saying use compost that has been adulterated with additional chemicals because you will get better results without showing proof that you are increasing the water holding and nutrient cycling capacity of your soil and not just leading to more chemicals running off biologically depleted soils. Just look to nature – did it need chemicals to make productive grasslands that fed millions and millions of buffaloes or to create an old growth forest? Somehow nature was doing a pretty good job without adding additional chemicals.

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#69. July 11th, 2011, at 7:41 AM.

By the way Don. I would love for you to call up Dr. Elaine Ingham and ask her about Craig Witt because they have worked together in the past. Compost tea is an additional application that can be used as a root drench and as a foliar. if you have properly amended your soil with a high quality compost that contains vermicompost, such as in the video I posted, you make compost tea every time you water!

Using extra compost tea is just to boost your plants even more but only if you are making your tea from a compost as shown in the video. I insist you review this website on the product you questioned in the video:

Please email me directly or comment again.

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#70. July 11th, 2011, at 12:16 PM.

I was using the pump bubble stones molassas it worked but now I just add a stocking filled with a cup or two of vc set it in a bucket for 24 hours and pour it on the base of the plants. I don’t know if I needed to dilute it more because when I sprayed it on the leaves they started drooping. So like I said now I pour it into the soil around the plant. Even if some one said it does not work I still have pounds of food wste not going into the land fill. I have plenty VC to add to my garden beds and containers.

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#71. July 11th, 2011, at 5:27 PM.

Cody –

Let’s be clear – I am a fan of well made compost tea for foliar applications, direct application of compost, compost extracts and any process that improves the soil food web in the soil. It has been shown “scientifically” that some of the benefits of a healthy soil food web are improved nutrient cycling, improved soil structure, and more pathways for air and water. And one of the best ways to insure a healthy food web is to add organic matter to your soil. The organic matter provides food for the biology in the soil. Compost and vermicompost provide organic matter as well as biology when added to the soil.

Back to your points – I see many claims and fancy words, like “humified” compost on the website you listed and they talk about lots of testing and experiments done in order to produce their compost – what I don’t see are test results. Just because someone worked with Dr. Elaine Ingham in the past does not guarantee that they make great compost. For example, they are adding mycorrhizal fungi to their compost, what species of fungi, and can they prove that the fungi is actually colonizing the roots when it is used. From research I’ve read – the spores need to make contact with roots within 24-48 hours max of getting wet – when are they adding the spores to their compost? Mycorrhizal fungi are fantastic, but you need to prove that the ones you purchased are actually colonizing the roots of the plants that you applied them to. Just because they are added to a compost doesn’t mean they will actually make it to a plant root. It is more effective to apply them to the seed right before it germinates or dip the roots directly in the mycorrhizae mix.

You state “you make compost tea every time you water” – that depends on your definition of tea – I wouldn’t call that tea, but I understand the point you are making. You state “only if you are making your tea from a compost as shown in the video” – there are lots of ways to make tea, that is not the only way, and that method is certainly not AACT(actively aerated compost tea), which he clearly says he will do in a separate video.

I’m sorry if the science or technicalities bother you, just trying to keep it real. Again, vermicompost is great stuff, well made tea has been shown to produce positive results, this website is extremely informative about vermicomposting, reporting observations is great, the scientific method is great, making claims by using fancy words without the science to prove your claims is just marketing fluff – similar to vitamin manufacturer claims.

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#72. July 11th, 2011, at 5:30 PM.

Here are photos of starter plants and the difference using compost tea made from vermicompost. The difference is quite astonishing.

Vermicompost is the key for enhanced microbiology that other organisms do not produce. Making vermicompost into tea is the key.

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#73. July 12th, 2011, at 5:15 PM.

Dear Don,

I think you may be now misreading my responses to you. The only reason I kept making references to the compost tea in the video is because I can only make claims about our own compost tea! Of course there are other ways to make compost tea and if you would of read my response we mainly make aerated compost tea using an earth tea brewer but I do not go into that because 99.99% of people do not understand the topics I would be talking about.

This point is obvious if you do not know what humified compost is. The results of our compost are all available if you contact our office. we have done thousands of soil tests throughout Northern Nevada to prove our compost. I do not put our soil tests up online because once again 99.99% of people would not even understand the soil tests that we use.

Yes, our my mycorrhizal applications in our compost work because why would we spend the extra money on adding something to a product if it didn’t! The marginal revenue on compost is so small that messing around trying to do “marketing fluff” like you say is not possible and would put us out of business.

As for results just check out the garden that we use only our products in to prove how well our compost and teas work. We live in Northern Nevada and only have a 3 to for month growing cycle inbetween frosts. Here are some pictures:

I have been documenting exactly what we are doing this year every month so you are more the welcome to keep up and see how we do. That is the true proof, not fancy words, just pictures showing us growing amazing plants in a climate that does not promote sustained growth.

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#74. July 12th, 2011, at 5:19 PM.

And we do not make compost tea every time we water. Once again if you would have watched the video that is for a once a week application. The video talks all about dilution and you can make any strength of tea. We make weaker tea so we can use it once a week instead of a watering time. Don, I would be more than happy to chat with you in person also rather than have internet blog battles. Please send me an email at Thanks.

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#75. July 12th, 2011, at 9:27 PM.

Cody –

Obviously I read your responses, watched the video, and visited the Full Circle website, and your blog. Perhaps you should read what I say more closely in response to what you say. I quoted you and then you misinterpreted my direct quote of you. “if you have properly amended your soil with a high quality compost that contains vermicompost, such as in the video I posted, you make compost tea every time you water!” My mistake, I only quoted the part that said “you make compost tea every time you water”, I thought you might know what I was referring to – obviously you are stating that if you have compost in your soil and add water, it is like making tea in the soil. I understand what you mean as I said in my prior post – but I still would not call that process making tea. That was my point of the quote – not how frequently you make tea. Does that help?

“Yes, our my mycorrhizal applications in our compost work because why would we spend the extra money on adding something to a product if it didn’t! The marginal revenue on compost is so small that messing around trying to do “marketing fluff” like you say is not possible and would put us out of business.” Perhaps you add it so that you can say that you have it in your product to make more sales? I asked some specific questions about what species of mycorrhizal fungi you add, and when you add them in the composting process, and if you have proof that they are actually colonizing the roots where your compost has been used, and you reply with that? Is that a scientific reply?

So do you work for Full Circle Compost? Is Craig your father, and does he own Full Circle Compost? Perhaps you should have said something about the relationship in your original post? I don’t mind if you want to market your product, but reread my first post in response to you to see my issues with the video.

“Humified” compost – please explain – yes, the composting process does produce humic and fulvic acids, but I have not heard of compost as being “humified” before. It does sound good though. Could you tell me the difference between humified and non-humified compost? I saw several definitions on the internet – all by people trying to differentiate their compost as “better” than ordinary compost? One required worms, one required microbes, but compost is “humified” by the composting process. Not all composts are created equal, but “humified” seems like a made-up marketing term to me, not a scientific term – I’ll be happy to be proven wrong.

I’m not trying to be impolite, but you keep persisting with questionable statements. I’m glad that your garden is lush, and that you are promoting vermicompost, composting, and sustainable practices. Claims without good science are just claims.

You’ll hear no more from me in regards to this, unless you choose to continue trying to answer my questions with non-scientific generalities. Let’s get back to the wonder of worms and good tea brewing.

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#76. July 12th, 2011, at 10:57 PM.


We pride ourselves on the science we have done to prove our product and proving this on this blog is not necessary. I would really appreciate if you would write me an email so I can answer your questions personally. The email once again is,

Our statements are far from questionable and I would love to show you that they are not. I will delve into a little here but of you but please email me so we could have a chat.

Our mycorrhizal application is proven by an increase in root colonization percentages from 2% to 56% at Red Hawk Golf Course in Nevada and Incline Village Improvement District. Pre and post application root colonization assays were performed in both situations.

Please do the research on controlled microbial composting by Sigfred Lubeke. This is the process we follow in making our humus. Humus is the end result of composting after being through the stomach of a microbe. Humus can be understood as the bank account in which your plants withdrawl nutrients from. The key difference between non-humified and humified composts is monitoring the oxygen and moisture levels in you aerated windrow composting system to create optimal environment for microbial break down and including a colloidal clay in the beginning of the compost recipe to act as a catalyst to initiate humus crumb formation in the build up phase, or last portion of the compost process. The clay having a high cation exchange capacity creates a positive electromagnetic field to collect the spilled cell contents from the decomposition process. All of this information is in the above scientific works by Lubeke and can be substantiated by the soil tests we have done.

The stage for creating humus is established by recipe and process. this method of composting to create humus can be substantiated by and please research:

~Dr Arden Anderson
~Pike Labratories
~Midwest Biosystems
~Steve Diver article in the ATTRA database

Back to the worms…why is vermicompost so important to humus and compost tea? Calcium. If you follow the procedures of high brix gardening you will see that calcium is the key to all plant productivity and growth. It is the truck that drives the nutrients from the humus bank to the plant. If you do not have calcium in you compost or in your tea you have no truck and the nutrients go no where. (Please refer to Dr Cary Reams and International Ag Labs to understand how plants really work. Also Dr Bill Jackson and his book Organic Soil Conditioning for proof on these items). Red worms have calciferous glands which produce natural calcium. We add extra calcium following the outline from International Ag Labs who view the necesities of plants from the eyes of the plant. Trace minerals not found in regular compost also must be added to sure deficiencies. We could go all into all the trace minerals and why we put those in but…Remember that all satisfied plants start with satisfied soils and thats what we aim to do.

As for making compost tea, once again the video and what I was saying is just for backyard gardners to pick quality composts and make the easiest tea possible at home. Real compost tea should be aerated and what we use are earth tea brewers with a specific microbial boosting recipe where we have documented microbial activity that I can also provide you. We have cured harmful fungi on trees by over staturated that malicious bacteria with beneficial bacteria in our aerated compost tea from an earth tea brewer.

Yes I do work with Full Circle compost but we are not here to just support are product but to give valuable information to people such as yourself on other ways of composting and looking at other people’s methods. That is my own personal blog where I share my ideologies about composting which happen to be what we have based a composting company from.

There are many more article on my blog if you have more questions or please contact me directly.

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#77. April 26th, 2012, at 1:02 AM.

This has been quite an experience just trying to absorb all the different views expressed here. I first saw this procedure in a video by a guy in (I believe Texas) and it was a rather unscientific “gosh by golly” kind of approach. It seems to work for him. Now I see that there are many people trying to refine the process. I am sure that by refining it their goal is to work out some of the problems that many folks didn’t even know existed. The commercial folks want to serve a market while the academics are following the old adage “Publish or perish”. Since the life span of AAVCT is relatively short it seems to me that it must be refined on a personal basis. What works for YOU. It looks like the procedure rather than the product makes the trip to the plants. The finest AAVCT created in Miami has little or no “fizz” when it reaches Chicago. As for the ingredients I have some thoughts. Here in Kingman AZ the overwhelming majority of hay for goats and horses comes from Fort Mohave AZ. Pretty much the “same stuff” so trying to factor in any differences (real or percieved) amounts to “much ado over nothing”. I can see that any shortcomings in batches of AAVCT can be identified and corrected. One post mentioned a shortage of N. Well perhaps a small amount of chicken manure could be added. HOWEVER, I do not know if the N would make the trip through the process and make it’s presence felt at the time of application. Another thought about commercial applications. Having hauled produce much of my trucking career I have seen many a drop of “whatever” applied to veggies. I think it would add another process in an already competitive process. The airating of perhaps 1,000 gallons, diluting and then administering it in the most productive manner while the minutes tick away. I will try the process outlined in “Deuleys own little Texas tea brewer” and see what it does. He claims you can dilute it at whatever ratio you want and administer it as often as you want. Like I said “gosh by golly” approach. If you search the title I just gave you Deuleys process will appear. It might not be perfect but it’l do.

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#78. June 12th, 2012, at 7:59 AM.

After raising worms in rabbit manure. I make my tea as needed. I grow over 2 acres for road side sales. Unfortunately I have hi dollar chlorinated water. I wanted an affordable carbon base water filter to brew my tea. After thinking about it. I wanted de chlorinated water for the whole garden. Rather than treat the whole property I wanted a filter that fit on my garden hose so I could just treat what I needed. I ended up having my own filter made. Check me out at

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#79. December 27th, 2012, at 7:51 AM.

I feel Worm and Compost Tea should not be considered a magic bullet or a Snake Oil that can cure all problems and improve poor soil without the addition of compost and other organic compounds. It should be consider one of the many tools to successful growing. As it is fairly easy to make and if done properly it may provide beneficial organisms to the soil and plants. I am not a scientist, but pure logic should tell you if you take a very clean container, add pure rain water to it, provide a means to provide life sustaining oxygen (air), provide the Worm Castings or Compost by a 400 micron leaching bag or directly, add food for the organisms that are leached out of the casting or compost and brew for a period of time. Something should happen. Use a microscope or have a test done for the results. Do do this scientificly many test have to be done the design and material the tank is made of, purity of the water and casting and compost,
areation method and oxygen saturation of the water, leaching method, organisms food and brew time. Then comes the controlled testing that can take years. Makes you tired doesn’t it. Fads come and go and people use fads to make lots of money. See how many miricle Compost and Worm Tea making machines on the market promoting all kinds of success. Have they been tested scientifically? Moral of the story is make your soil healthy by use of good compost and organic compounds then use Worm and Compost to build up the amount of benifical organisms.

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#80. April 10th, 2013, at 8:36 PM.

Get a microscope and look at the microbes you will understand. You can’t trust any experiment that does not show the document the quality of the compost as well as the tea. Compost tea only works when you have the right organisms in the tea.

Plants grown with good microbes grow just as nature intended. Plants without good microbes are deficient in nutrients and the pests come and eat the weak plants. And you can’t judge your results based on plant height. How about a tissue sample. How many nutrients are in the plant. That’s why food grown with compost tea taste so good.

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#81. June 5th, 2013, at 12:38 PM.

Here’s an article I read just today (although it’s dated 2009) from the USDA that touts the benefits of worm tea.

I’m new to the whole worm thing so this is my first year using it on my garden. So far, anecdotally of course, I was doing well with no bug damage on my plants, but then we had a couple of weeks where it rained often and I didn’t use any worm tea spray on them. The bugs have feasted on my plants. I’m back to spraying them now that the sun has returned and I’m seeing less new bug damage. Half of my garden is in containers and the other half in a raised bed. Both seem to be doing well. I’m starting a worm tea experiment today with 4 pots, two with my potting soil mix and two with regular soil, one of each will have worm tea and worm castings used and the other will be plain water and regular compost. I’ll post the results on YouTube in a few weeks.

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#82. June 20th, 2013, at 7:15 PM.

Sir I have started only this year using compost tea and worm tea and mixing both and I have found it incredible for all types of vegetables.Now I am sure I have probably never made the same precise mix each time but it seems to be growing my veg at a much faster rate and in a lot more abundance. I live in Dublin Ireland and we suffer with a lot of slugs and snails of all descriptions and other flying veg eating bugs also and since I started using the compost tea on the foliage of my plants none of these bugs attack them which is great but that leaves me wondering if a bug won’t eat it is it safe for me to eat ? Do the bugs know something I don’t ? or is there a natural insecticide in compost tea ? I would love to know the answer to this question if anyone has one
Regards Phil

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#83. July 24th, 2013, at 7:25 PM.

Phil, bugs and slugs perform an important role in nature and nutrient recycling helping to break down vegetation in the process of creating humus. Healthy vegetation with high Brix readings is of little interest to bugs and slugs. Unhealthy, decaying vegetation is their preferred target food source. I’ve seen the results in my home vegetable garden and in my pasture where clover was once heavily targeted by Red Legged Earth Mite. As Brix levels rose the mites disappeared.

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#84. January 24th, 2014, at 5:50 PM.

First of all, a huge thanks to Bentley on starting this great dialog! I am a Vermiculturalist & have been for many years. They’re are so many good comments I don’t know where to begin. One thing I think is relevant to the novice as well as the experienced Vermiculturalist that wasn’t mentioned is the deleterious impact Chlorine has on all things organic. I have always used rain water in my thermophyllic and mesophyllic bins. Living 25 mi southeast of Seattle affords me a lot of rain water. During the dryer months I use city water but I actively aerate each 55g barrel ( have 7 all linked together ) for a minimum of 48 hrs. I have always had excellent results with my vegetables & flowers. For those who use Chlorine, avoid it at all cost. The anecdotal v scientific dilemma is problematic but not insurmountable. I have attended 3 of the 14 vermicomposting conferences at NCSU, spearheaded by Dr.Rhonda Sherman. I will continue at least every other year because I enjoy the ” science ” behind the process. If you can afford it, I highly recommend attending when you can. It is beyond worthwhile.

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#85. May 2nd, 2014, at 11:35 AM.

I am new to vermicomposting but not new to the world of publishing, having been a journalist for 20 years. Could be the article was a direct attempt to boost chemical fertilizer sales. It only makes sense that the compost tea is going to be beneficial. To what degree is dependent on a number of variables but of course so are manufactured fertilizers. It’s the natural process that is the point. Thanks so much for your site. It’s my go to for information in my worm wrangling (as my husband calls it)

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#86. June 3rd, 2014, at 11:31 PM.

There have been heaps of interest in leachate in the past couple of years with more and more people taking on worm farming and just recently huge interest in the brewed worm tea. Type it up in Google and you will find heaps and heaps of pages on people advocating vc and worm tea compared to negativity about it. That’s gotta tell us something! !! I also want to say that not everyone’s vc or tea is the same- you could be the type to put cow manure in yours, lawn clippings or alfalfa pellets or you put none if those! ! But if you find that it works for you, don’t worry about what everyone else thinks. Just keep using it! ! Works for me wanting to be an organic gardener, I save heaps and there’s never a day when I actually run out! There will always be some vc in my bin do just do what works for you and omit or change what doesn’t.

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#87. August 6th, 2014, at 1:07 PM.

For all you compost tea keeners (especially those with an interest in aquanponics) still tuning in, I’d love to get your input on some questions I posted here:

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#88. April 3rd, 2015, at 11:11 AM.

i gotta start with saying i love your site its my go to for anything worm related. sorry for the long one but this will be worth reading. now, i started brewing compost tea about 5 years ago. just from good compost alone at first. i had a few foul smelling batches years ago but i used them either way and didnt notice as much death from a bad batch of compost tea/ too much compost tea compared to chemical fertilizer so i would say it isnt very “harmful” as far as burning foliage even in a sour batch. i have since got my recipe down to what i feel a perfect fool proof way to make perfect worm tea every time havnt made a sour smelling batch for 2 years! just nice earthy sweet forest/pondy smells. i have gotten the tea down to a science and i now use it once a week in the growing season! i use compost tea when i water, yes once a week and for tucson, az in the middle of the desert with 115 temps and dry as a bone in the summer my friends dont understand how i can still get away with watering once a week i cant explain it either but that how it works. THIS BREWED TEA IS THE ONLY THING I USE! at all. seriously. i mean i do use lots of E.W.C., and compost in the yard but thats once or twice a year and i only use about 2 or 3 cubic yards compost on my 100 by 40 foot garden that about one or two inches across the top i would guess. the biggest thing tho is i apply liberal amounts of straw ALWAYS even once a month in the heat of the summer as a food source for the micro organisms because a few years back i noticed some problems when using compost tea on a regular basis. the organisms would consume all my organic matter in one month! and the balance would be thrown off the plants would naturally loose their leaves to make up for the loss of nitrogen and my garden wouldnt grow properly again for 3 months to a year for some plants. the TRICK is to always have 2 to 4 inches of STRAW (or leaves or other fast breaking down material but not so much wood chips). with the huge jump in organism numbers and without this food source your organisms will run out of food and eat each other just like we would! ok not exactly but you see my point. the last year i started not thinking about when to fertilize my trees and thought more on what/when to feed my organisms and native worms. i wish i could show you the results, the smells in my roses the green in my trees from NOT using conventional fertilizer at all anymore. who would have thought?

i also heard people saying “ohh never ever spray that tea on your leaves” and guess what i have the complete opposite of bad. ive been combating powdery mildew in my yard and black spots on the leave of my rose and orange trees for about 3 years or more. at least that when i noticed the problem. well i went to the store and bought a few different things like neem, copper fungicide etc a few different times and the spots always came back from using these, but when i sprayed a heavy dose of worm casting tea on my orange trees leaves i couldnt believe it. they shoot out new growth they havnt in years and they just dropped every single leaf with black spots! i raked them all up and havnt seen a black spot in 6 months! i dont understand what happened here but i asume the tree got a healthy enough drink (from the leaves) to eat, that it had the energy to shed its leaves properly. out with the old in with the new. and removing the bad leaves out was important. again no conventional products. all natural earthly material all made by yours truly.

want to talk about my special worm tea recipe email me.

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#89. May 10th, 2015, at 9:17 AM.

When Harvard (The Ivy, world famous, second best university in the world ) is using compost tea for its beneficial effect on its lawn, you can believe that “some” serious research had been done. (Link below)

The lawn treated with this compost tea has root 10 inches deep
The lawn treated chemically has root 3.5 inches deep

There is an episode of the WGBH Ask This Old House series dedicated to the “Harvard Brew”
Watch the episode on Youtube, you’ll see for yourself. You’ll also hear one of the best genuine Bawston accent ever from the Roger the landscapah. :)

As an FYI, MIT (Best university in the world) is now also using this technique.

Best regards to all

Youtube video

Organic Tea recipe

Build your own

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#90. June 13th, 2015, at 10:35 PM.

I am always willing to experiment to prove for myself if something works or not. I will not just take someone’s advice or opinion as true or factual. If an experiment is not dangerous and doesn’t require hard-to-find or expensive stuff, then I will try it. I have used worm compost tea, and well, coincidentally, had great results. So to heck with the articles and the naysayers and the critics, the skeptics and the statisticians. Get your feet wet and try something new. Even if it fails you will have the satisfaction of knowing the truth, and probably learned a little extra something along the way :)

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#91. June 30th, 2015, at 8:42 AM.

Well, I love that this blog post has continued to have comments since 2011. This shows that compost tea is not just a fad and is still a main topic point for gardeners and growers. Thank you Red Worm Composting for the post (I originally commented back in 2011 and still here as well!).

To complement this post and prove that compost tea does really work (I know this is a link to my blog but I have some awesome pictures of the results using a vermicompost tea in Nevada) you all should take a look at a recent post I did. We make a specialty vermicompost tea that is kicking plants into growing gear: Does Compost Tea Really Work? (

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#92. May 31st, 2016, at 12:41 AM.

I think one of the best things about compost tea is the fact that you don’t have to have multiple bins or even a huge one. Just grab some castings, prepare the tea and return the castings into the bin to refresh the microbe population and get ready for the next batch. It would seem that the regularity of brewing is the largest concern for discussion. Some say every week, some say every month or even a different schedule relative to the time of the season. It shouldn’t take long to figure out what works for YOU and go with it. Anything is better than nothing.

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