this well-behaved species does not spread vigorously like common milkweed. Its vibrant orange flowers and deep taproots make this species drought-tolerant in well-drained soil. Swamp milkweed (Photo ...

If you are looking to attract the endangered monarch butterfly, only 30 milkweed species are used by them regularly. Other species of this native perennial, like swamp milkweed (Asclepias ...