Everybody knows "Common Milkweed," the tough leathery plant with the dusty lavender blooms that are favored by Monarch butterflies. Swamp Milkweed is close to this variety, but much more elegant. The leaves are less coarse, and the plant is usually sort of willowy and tall. Best of all, the blooms are cherry-red and also welcome monarchs and hummingbirds. As you can tell by the name, this wildflower prefers wet ground, but in full sun.