Tall Green Milkweed (Asclepias hirtella)

I tried multiple times to get this milkweed to grow but was unsuccessful. The plants looked great when I received them but took a slow decline over a few years before dying after planting in some horrible clay soil. I did see several plants blooming in the wild this year on private land and they were loaded with blooms. If you have decent dirt this would be a great addition but I wouldn't waste time planting in clay. Luckily butterfly milkweed has done well.