I wish worms would leave my garden alone. They eat the compost that I mix into my sandy soil. They leave behind water-repelling worm casings, leaving a 'soil' that resembles a fine-textured grape-nuts cereal with the absorbency of plastic. The ONLY way to wet my soil then is via slow drip -- water from a hose goes right through it all the way to China.
I've heard that I'm no longer the only one
who recognizes the down-side of these non-native squirmies. People who
fish up north are being urged not to toss their unused worm-bait into
the surrounding shrubbery. Escaped worms will decimate the soil humus,
and there go the wildflowers.