Butterfly Milkweed, Asclepias tuberosa, 50 Certified Pure Live Seed, True Native Seed FREE SHIPPING Number of seed is Pure Live Seed, not bulk Species US Native, not introduced alien We grow the seed so we control quality A 2 to 3 tall native perennial with clusters of bright orange flowers. A late spring and summer flowering plant that does well in dry to moist soils in full sun.