Why did I plant this? I planted this because it is a member of the Milkweed family, more specifically, Asclepiadaceae – the only family that the Monarch Butterfly will use to lay eggs. I spied several Monarch caterpillars the very first year I planted it! It smells delicious when in bloom (humming birds are attracted to its flowers as well) and the seed pods are pretty in the fall. It will spread readily. For this same reason I planted Butterfly Weed (A. Tuberosa).