Meredith, you shouldn't be too far behind us. Okay, maybe a little.
I actually haven't seen a Black ST yet, although I've seen the Giant, Tiger, and Polydamas. We've got tons of parsley, dill and rue at MOSI and I've got my rue plants in the ground so we're ready! It would be nice to know of some native plants they would use. I'm going all native with my milkweed and pipevines this year. Okay, except the Giant Milkweed. I'm saving that until my native milkweed seeds germinate and grow. But I'm really trying to go native.
It's so great that you caught butterfly fever! If you click the link in my signature it will take you to the MOSI Outside blog where we talk lots about butterfly gardening as well as native plants and other things. And we're always up for talking butterflies in this thread! Also, planting host plants is the way to go. I always tell people that butterflies will visit your nectar plants, but they will stay for your host plants.