Worms can be invasive study says
I read an article in a farming magazine at the library. I don't recall the name. Anyways, it said that exotic european worms (which are the ones used in worm bins: red wigglers and nightcrawlers) are good for farms (and worm bins I might add), but when released into the wild they can be damaging to forests. I found this interesting and informative so I thought I would share.
I am going to add an article below from the same study, but different news source.
Here is a link that might be useful: spread of earthworms