The fleshy pink flowers are of the usual intricate asclepiad design and contrast well with the soft pale foliage.
Almost any soil as long as not too soggy or parched. Works well with other large prairie plants. It can run somewhat so not something for very neat gardens.
Another lovely milkweed from the USA, this one very much a western species. Adaptable and easy here given full sun. A willowy perennial with very narrow leaves and very pretty pinkish white flowers all summer.
We don't see much of Asclepias in gardens in the UK but they are well worth trying. I have a bit of a thing for them.
1L pots ~ £7