They host on beans. Porter Weed A Florida native. Great nectar plant. Comes in coral, white or blue. I have coral and blue.
Coral is the prefered color to the butterflies.
It is the second most visited flower in the garden. I did save some seed, but never got them to germinate. I've got to unlock the combination to get them to germinate. I worried for nothing - the blue Porterweed reseeded itself to the point of being a true weed. I did purchase another coral colored plant this year too.