I've got plenty common milkweed, swamp milkweed, and butterflyweed. Last year I finally got a small amount of
A. purpurescens seed. I had mediocre emergence, then mortality as the year set in. Finally, I was left with 6 plants (under 1 foot in height). I planted them in two separate locations. They suffered quite a bit. One patch of three was trampled by a cable installer.

The other group of three...who knows? They didn't look good going into frost but we'll see. This last fall I was given a small packet of seed which I winter sowed. Now I'm looking for seeds to hedge my bet.