This time of year green worms can be many different butterfly larvae but the cure is the same - just start plucking them off and dropping into a pail of salt water if you don't want to squish them. Look under the leaves and check with a flashlight at night. They also hide in the soil near the base of the plant. Handpicking is very effective for home gardeners and is a bit like a treasure hunt so get some kids involved if you can. Keep growing, Marianne Binetti