Mappy! Been awhile, hope you and yours are doing well!
My prob four fav plants in the butterfly garden are the swamp milkweed (Asclepias Incarnata), Pentas, Lantana, and Celosia.
Only the milkweed is an perennial of the four, but doubles as a nectar and host plant for the monarchs. (And for some random critter I haven’t been able to id yet.)
The others are annual nectar plants with the Pentas attracting the most butterflies, the Lantana a great all around pollinator attractor, and the Celosia being the bee magnet. Results may vary...
The pic of that swallowtail cat came from the dill, rue, fennel, and parsley containers I have in the b garden. New addition this year and have never raised those cats before. Now I’m caring for a dozen. P cool.
Are you looking to provide a habitat or raise a few? Regardless, it’s waaay fun.