Butterfly Weed

Butterfly Weed (*Asclepias tuberosa*) is arguably the most vivid and ecologically vital native wildflower of the American prairie and meadow, blazing in brilliant shades of fiery orange and golden-yellow in midsummer and serving as one of the most important nectar and host plants for the endangered Monarch butterfly and dozens of other pollinator species. A member of the milkweed genus (*Asclepias*) within the Apocynaceae family, it is both the most brilliantly colored and the least 'weedy' of all native milkweeds, making it an outstanding choice for ornamental native plant gardens.

Unlike most milkweed species, Butterfly Weed is notable for its complete lack of the milky sap that gives the genus its name — its sap is clear. This is a distinguishing characteristic, though it remains just as important to Monarchs. The flowers are extraordinary in their construction: the five petals are reflexed downward while five specialized structures called 'hoods' and 'horns' project upward, forming a complex central crown. These structures hold the nectar in a way that requires pollinators to step inside the flower and pick up or deposit pollen masses called pollinia — a highly specialized pollination mechanism unique to milkweeds.

Ecologically, Butterfly Weed holds a central place in the prairie ecosystem. It is a critical nectar plant and larval host plant for the Monarch butterfly (*Danaus plexippus*), whose larvae feed exclusively on milkweed foliage. The orange flower color is particularly exceptional — it attracts a remarkable diversity of pollinators including Great Spangled Fritillary butterflies, Swallowtails, Painted Ladies, bumble bees, and even hummingbirds. In late summer, the plant produces long, spindle-shaped seed pods that split open to release hundreds of seeds attached to silky white fibers, carried by wind across the meadow.

Despite its common name, Butterfly Weed is the opposite of weedy — it is a refined, well-behaved, and elegant garden perennial. Its deep taproot (which gave it the medicinal name 'Pleurisy Root,' used by Native Americans and early settlers for respiratory ailments) makes it exceptionally drought-tolerant and long-lived once established, but also means it resents transplanting. It is best started from seed or purchased as a young potted plant and placed in its permanent location early. It emerges late in spring, so mark its location to avoid accidentally disturbing it. Explore our Flower Identifier for more prairie natives.