All earthworms in Ontario are non-native and harm the environment.
However, invasive Jumping Worms (JWs) cause much more damage & spread much more quickly. They can kill plants by removing nutrients from the soil, and leave behind bare, dry granular pellets. They are a threat to our gardens & lawns, farms & forests, as well as bird and animal life.
Invasive Jumping Worms have been confirmed in Ontario during the summer of 2021 (Dundas Valley, Toronto, Windsor).