Whorled Milkweed is a host plant for the caterpillars of threatened monarch butterflies, who can only eat milkweed. Monarch populations have fallen by more than a billion over past decades. We have chosen to offer this particular milkweed because of its late bloom time -- around July to September -- because late blooming plants provide critical nectar for migrating monarchs. The nectar of the flowers attracts many kinds of insects, including long-tongued bees, short-tongued bees, butterflies, and skippers.  Whorled Milkweed has skinny, "whorled" leaves. It grows to 2', full to partial sun, medium to dry moisture, is deer and rabbit-resistant, and will spread.