TY. : ) It's welcome to own the whole area where it is. The overall goal is to eventually fill all spaces with perennial plants for the hummingbirds, butterflies, and bees. Nectar-a-rama. I have some seeds of other species of Asclepias (tuberosa and speciosa), getting a late start but going to see if some of them will sprout. The species can duke it out for the territory.