One of my favorite flowers is this purple eupatorium. All spring and summer, the butterflies are attracted to it. In this photo, it has just been stripped of allll it's leaves because of one certain kind of caterpillar.
The flowers are very attractive to the migrating monarch butterflies. So, starting in late summer, I put extra organic Medina granular fertilizer on it, so it will be really full of flowers when the monarchs are passing through. Medina granular is the fertilizer I use spring and summer on everythng and extra on all the flowering plants throughout the blooming season.