by Kathy Van Mullekom, a lifelong gardener and gardening writer living in York County, VirginiaEach summer, I chuckle when neighbors and friends ask why caterpillars are eating their parsley, dill and fennel. They want to know how to kill whatever rascal is doing the damage. With a straight face and slight sternness in my voice, I quietly explain that those horrible caterpillars will soon morph into beautiful butterflies. But, first they need to eat. Oh, they quickly reply, smiling at the thought.