I bought and grew several Asclepias purpurascens over the last couple of years. It never takes off because it is always eaten by animals. A incarnata has been much better for feeding monarchs and producing more plants. I still have more purple milkweed seeds so I will try it one more time somewhere away from groundhogs and rabbits. Same with Redring milkweed. Seems to be very tasty to the wildlife. I think I will have to grow both of these under a row cover for a couple of years, maybe a raised pot or bed.