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Do we have native earthworms?

Map of native earthworm populations in the U.S.In gardening circles, worms are considered a panacea.  In ecological circles, though, you'll hear talk of the dangers of invasive earthworms.  So, what's the dirt on wrigglers?

I've heard it bandied about that there are no native earthworms in the U.S.  Wrong.  The Wisconsian glaciation, which ended 12,000 years ago, did wipe out earthworms under the ice, but this only affected the northernmost states.  Since then, the native worms have advanced back north a bit past the glaciation line. 

Here in southwest Virginia, we've got native worms.  Unless you live out west or way up north, you probably do too.


This post is part of our Earthworms in the Garden lunchtime series.  Read all of the entries:





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what is native anyway?
I was wondering what constitutes native. How many generations must a yankee worm have lived in an area, for instance, to be considered native. Presumably the nonnatives worms that Mom and Aunt Ruth played with growing up were born right there in Massachusetts, right? Just interested.
Comment by Maggie Ellen Robin Hess Mon May 18 17:28:17 2009
comment 2
Well, it definitely takes a lot longer than 60 years for a new species to get sucked into the ecosystem. Stay tuned for tomorrow's lunchtime post which will enumerate all of the evil things the invasive worms do.
Comment by anna Mon May 18 21:10:34 2009
comment 3
How do you tell a native earthworm from an invasive earthworm if you don't understand their language or get them to come up and tell you?
Comment by Sheila Tue May 19 21:49:20 2009
comment 4
I'll be posting a link today to a key which you can use to check whether your earthworm is invasive. I wish there was one simple answer, but unfortunately there isn't!
Comment by anna Wed May 20 08:05:50 2009

I have had some construction done on my homestead and the soil was highly compacted in places. I would like to use mulch and NATIVE earthworms to loosen the soil. Can you tell me which species are native (I have read that there are a couple of species but I can't find their names), and where I may be able to buy a couple thousand of them to get things started.

Thanks Stewart (also in southwestern VA)

Comment by Stewart Colley Sat Mar 25 09:30:04 2017

One very unique homestead, $1,500 per acre, the opportunity of a lifetime