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Using Putrid Worm Tea

Here is a question from Debra:

Good AFternoon,
I am relatively new to the vericomposting craft. I just love the
ideal of making use of all that we are blessed with. My Grandmother
used to tell me “waste not…want not”.
Anyway, I have a vericompost bin set up (approximately 5 months now).
I have been harvesting the liquid; keeping it in gallon jugs until
Spring. I live in the Pacific Northwest and we have some pretty
extreme temps during the winter. I’ve noticed a very strong smell
from the liquid with a thin film on top. I am assuming that this
indicates anarobic (the bad bacteria) growth. Can I use this liquid
with the bad smell; should I try to airate it with air stones before
use? I don’t want to harm any of my precious plants come spring time.
But I also do not want to discard something that I could make usable.
Thank you for your website and your words of wisdom. We, in the
field, appreciate all you do!

Hi Debra,
Interesting question. In all honesty, I definitely wouldn’t put worm bin leachate in bottles and just let it sit for months – the potential for it becoming a putrid mess is pretty high!
I hate to recommend getting rid of ANY potentially useful resource though (remember – even ‘wastes’ are just misplaced resources), so I certainly wouldn’t tell you to just chuck it.

Bare minimum, you really should dilute it and start aerating it well before trying to use it. Use your nose as a quality tester – as long as it has any bad odor you definitely don’t want to use it. Even once it is fairly odorless, I’d still recommend using it with caution – maybe pour some in an area of your garden you aren’t all that concerned about. Or simply pour it on some weeds – who knows, maybe you’ve invented the ultimate weed killer and don’t even know it! (just for fun, maybe you could try out the pure, unaerated stuff and see what happens)
:lol:

Once it looks as though it’s not going to harm your plants, you can probably get a little more bold with your use of it.

Hope this helps!

Written by Bentley on February 25th, 2009 with 3 comments.
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3 comments

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Get your own gravatar by visiting gravatar.com Kim from Milwaukee
#1. February 25th, 2009, at 7:42 PM.

My sister used some of my first worm tea, which really stunk (I didn’t know that it shouldn’t!). She said the smell goes away pretty quickly, and her plants love it!

I diluted it down alot, though. Maybe that helped.

Get your own gravatar by visiting gravatar.com Bentley
#2. February 28th, 2009, at 7:14 PM.

Hi Kim,
Dilution definitely helps (makes it more aerobic and reduces concentration of any potentially bad stuff).
Stink doesn’t necessarily mean it’s going to harm the plants, but there certainly is a greater likelihood than if it doesn’t stink.
:-)

Get your own gravatar by visiting gravatar.com Jessica
#3. April 2nd, 2010, at 1:16 PM.

I have a flow through bin. The active trays have a wonderful earthy smell. However, the harvested tea is definitely smelly. I understand from this post that I should handle this with care, i.e. dilute and aerate before adding to plants. But, what about using the tea to prepare a bed? We won’t be planting outdoors for another 6 weeks or so. Do you think it would still be a problem for the roots? Also, just because the tea has gone “bad” does that mean it’s no longer nutrient-rich? Or rather that it just has some additional “bad” stuff too (i.e. alcohol)? Thanks.

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