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Attracting Compost Worms in Your Backyard

Here is a question from Francisco:

Hi there,

I am learning about worm bins and have been trying to start one just
by catching them in the backyard. Your blog is great and I have spent
so many hours reading the old posts.

I am not sure if the worms I catch are even good for composting.
Unlike what some people have done, I don’t just go outside after it
rains to try to find them. I have been putting wet cardboards in
shady/wet areas of my yard that have a lot of old dead leafs. I would
move the leafs and lay down the cardboards. To my surprise, I am
catching a couple of them every time I left up the cardboard. The
worms are fairly red, very thin and about 1/2 to 3/4 of an inch long.
Since they are coming up to eat the cardboard, is it safe to assume
they are composting worms?

Any help would be greatly appreciated.

Keep up the good work on the blog, I know I will definitely be
reading it.

Thanks.

Francisco

Hi Francisco,
Thanks for the email – that is a really great question, and this is certainly a topic in general that quite a few people have inquired about. Unfortunately, there seems to be a very common misconception that any old type of worm can be used for worm composting – which as you obviously know, is not the case. To compound this issue, the first worms people usually think of are the ones that come out after a heavy rain and/or those ones encountered when digging around in the garden. More often than not, these are exclusively soil-based worms – NOT those species adapted for life in rich organic matter (such as that found in a compost heap or worm bin)!

There are three basic groupings of earthworms – 1) ‘Anecic‘, 2) ‘Endogeic‘, and 3) ‘Epigeic‘. The anecic worms, such as the large ‘Canadian Nightcrawlers’ (aka ‘Dew Worms’ – Lumbricus terrestris) build deep burrows, typically extending down to the mineral soil layers. They live a relatively solitary life (coming up the the surface for feeding, mating, and to escape from flooded burrows), and generally thrive at cooler temperatures than those worms in the other two groups.

Endogeic worms are basically the intermediates between the other two groups. They are still soil worms, but are typically located closer to the soil surface. Unlike the anecic worms, they often create horizontal (rather than vertical) burrows.

The last group, the epigeic earthworms, are of course the ones we are most interested in from a composting stand-point. This group generally lives at or above the soil surface – typically associated with concentrations of rich organic matter (eg. leaf litter, manure etc). They also tend to be much more tolerant of crowded conditions and wider fluctuations in temperature. Because they live in these potentially harsh/challenging environments, epigeic worms also tend to grow and reproduce much more quickly than the other groups of worms (helping to ensure the success of future generations).

You are certainly on the right track with your approach, Francisco. If there ARE any epigeic species of worms located on or near your property, there is a decent chance you will be able to attract them to an area where you have added organic matter on the soil surface. Whether or not you will attract the best species and/or enough worms to make your efforts worthwhile, is another matter altogether.

I know that if I did the same thing in my own yard, I would end up with lots of Red Worms (Eisenia fetida) concentrated in the organic-material-rich-zones. As an illustration, I recently left a few (freshly harvested) zucchinis on my lawn for a day or two. When I went to collect them, I discovered a handful of small Red Worms underneath each of them! I can only imagine how quickly I could populate a heap of aged manure if I dumped it on my lawn!

If one of your neighbors happens to be composting with worms, or if they have found their way into the area via some other means, you may be in luck! More than likely though, you will end up with a mix of epigeic and endogeic species that just happen to be living close by.

The fact that you’ve found some small reddish worms could be a good sign, but the only way you will know for sure if they will work is to put them to the test in a worm bin. As for them coming up under your cardboard – this is pretty common for most types of earthworms. Leave just about anything to sit out on your lawn for long enough, and you’ll likely end up with quite a few worms congregating underneath.

Hope this helps!
8)

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Written by Bentley on September 25th, 2009 with 5 comments.
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5 comments

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Get your own gravatar by visiting gravatar.com Ann
#1. October 18th, 2009, at 6:10 PM.

Hey Bentley –

I was ridiculously excited today when I checked my worm bin after ignoring it completely for probably 3 weeks: 1 week due to influenza, the following 2 due partly to catching up on life after a week of illness, and the rest from pure fear of what I’d find when I lifted the lids…

What I found, instead of the complete disaster I half-expected was exactly the opposite! Happy, happy worms – with only a few dopes up on the lid now – who are getting bigger and… (drum roll, please) have produced EGGS! I was way more happy about this than anyone else in my family, so I guess I just wanted to share that with someone who understands… ;-)

ANYways, my question is actually about a small container of worms my husband would like to add to my bin. He bought them for fishing bait, but they are definitely not night crawlers. The container says “Leaf Worms,” which doesn’t help me at all. They are slightly larger than any of mine, and also a bit darker. For whatever it’s worth, they are congregated on the very top of the small amount of soil in the container, and dive under when I take the lid off to check them out…

Do you think it would be okay to add these to my bin?

Thanks, as always, for your help!

-Ann

Get your own gravatar by visiting gravatar.com Bentley
#2. October 19th, 2009, at 5:34 PM.

Hi Ann,
I am always harping about the fact that it is far easier to succeed with vermicomposting when you totally neglect your worms, than when you try to “take care of them” too much! Thanks for helping to support the cause by sharing your findings, Ann!
:lol:

“Leaf Worms” is supposed to refer to Lumbrucus rubellus (another type of ‘Red Worm’) – but it’s hard to say for sure. May simply be Eisenia fetida (often mislabeled as L. rubellus) – the bottom-line here is that they should at least be ok for composting, so do try them out!

Get your own gravatar by visiting gravatar.com Ann
#3. October 20th, 2009, at 9:10 PM.

Aw shucks, Bentley, anything I can do to help! ;-)

Get your own gravatar by visiting gravatar.com geri
#4. October 23rd, 2009, at 3:04 PM.

Hi Bentley,
my friend gave me a bag of home compost & in there, i found many small worms that look very similar to young red worms. Only difference is that they are more active & tend to “jump” when touched.
my friend suspected that those are red worms that had “migrated” fm her worm bin to the compost bin (both bins are placed side by side)
will you be able to ID it?

[IMG]http://i67.photobucket.com/albums/h281/gloke/IMG_8129.jpg[/IMG]
[IMG]http://i67.photobucket.com/albums/h281/gloke/IMG_8130.jpg[/IMG]

is it safe to mix them with my bin of red worms?

geri
singapore

Get your own gravatar by visiting gravatar.com Bentley
#5. November 3rd, 2009, at 8:26 PM.

Hi Geri – tough to get a good look at those worms, but based on your description I would say that you might have ‘Blue Worms’ (Perionyx excavatus) – these are definitely much more active than Red Worms, including the tendency to leave worm bins for no apparent reason.
If you have more pics feel free to let me know.

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