Swamp milkweed (Asclepias incarnata) photo by Michael R. Jeffords Swamp milkweed prefers wet ground and grows 2-4 feet high. Small umbels of pink flowers bloom above narrow lanced-shaped leaves. Easily identified long pointed seedpods develop after flowering. These produce abundant cottony parachute-like seeds. photo by Jerry Kumery When stems and leaves are broken, a droplet of milky juice forms. The milkweed is a host plant for the monarch butterfly.