ROLF. That was funny.

Anyway, raccoons dig for earthworms, grubs and other insects.

There's really no way to get rid of these things in your yard (and you wouldn't want to anyway, especially the earthworms. they're your friends )

You could, however, cover the ground around your plants either with a landscaping fabric or, if the raccoon manages to dig through that, some chicken wire. lay the fabric or wire down on the ground around your plants and secure it with landscaping staples. You'll want it as close to the main stalk of the plant as possible without actually touching it, making it impossible for the raccoon to damage the roots of your plant with his digging.

If you want, you can cover the landscaping fabric or chicken wire with mulch so it doesn't look so ugly. The mulch will help the ground retain some moisture, too.