In this Covid time, we started a bit of an herb garden.Our dill plants are super popular with the dozen or so black swallowtail butterfly caterpillars. We find this kind of exciting but now feel responsible for their well-being. I think they're going to eat all the dill in short order. I know they also eat parsley and carrots and fennel...but I don't think we can get enough in the ground for them. So....could we maybe transplant them into a terrarium and just feed them parsley and dill from the grocery store? Then let the butterflies go?