(Asclepias incarnata) Native to the eastern US and grown as an ornamental in US gardens since the early 1800s, this pretty pink milkweed produces upright bloom clusters full of food for all sorts of butterflies. Pink Butterfly tolerates wet conditions well (another common name is "Swamp Milkweed") and attracts many butterflies. 4-6 feet. Most to full sun. Perennial. 25+ seeds.