Heck, I'll gladly donate my parsley to help butterflies, but there were 14 of them at one point & I had a small crop this year. I was afraid they would starve, so today I took them to a local nature reserve that has a butterfly garden & they are going to care for them. I just have no other plants around that the Black Swallowtail caterpillar eats (per the info I found on the internet.) So next year I'm planting tons of dill & fennel just for them. Just thought I'd share.