Feeding Swallowtails

Swallowtail caterpillars love my parsley plants, but they eat through the herbs too fast. Do you have any other suggestions on what to feed them?

—Irene Rosier, West Columbia, South Carolina

Tom: You must be referring to the black swallowtail caterpillars. They really love parsley. Try planting a row of carrots. This will usually keep them from eating all the parsley. You can also try feeding them dill or fennel.