Hi, thanks for the question.

Worms are not recommended for introduction into gardens due to the potential ecological harm they can cause. Bringing in non-native earthworms to ecosystems where they were not previously found can alter the soil structure, nutrient cycles, and plant communities. It’s best to allow earthworms to populate your garden naturally if the conditions are suitable. Healthy soil is the best attractant for earth worm.  Depending on your soil type you may not even see earthworms.  Attract them to your garden with organic matter, reduced tillage, and mulching.  Two species currently not considered directly harmful are Eisenia fetida and Eisenia andrei  but their presence should be monitored to ensure they do not disrupt local ecosystems in Michigan. Check out these links:

 Should I put earthworms in my garden? | Extension (unh.edu)

Earthworms (psu.edu)

I hope this is helpful.

Hi again,

Since there are no earthworms native to Michigan, the two species mentioned are the least likely to cause problems.