Poke milkweed (Asclepias exaltata)
Poke milkweed is one of Wisconsin’s native woodland milkweeds and an important contributor to shaded‑forest food webs. This tall perennial, often reaching three to six feet, bears loose, drooping clusters of white to greenish‑white flowers that hang from the upper leaf axils rather than forming a tight cluster at the stem tip. Each flower has five reflexed petals and a delicate crown structure typical of milkweeds.
Its broad, opposite leaves—oval with a pointed tip—capture filtered light in the understory and provide essential forage for monarch caterpillars, which rely on milkweeds for survival. The flowers supply nectar to a wide range of pollinators, including woodland bees, moths, syrphid flies, and early‑season butterflies, making poke milkweed one of the few milkweeds that supports pollinators deep within forest habitats.
Poke milkweed grows in moist, shaded woodlands, along stream corridors, and on cool, north‑facing slopes where soils remain rich and slightly damp. By anchoring pollinator activity in the understory, it helps connect forest ecosystems to the broader landscape of meadows and openings where other milkweeds thrive.
Sources:
Freckmann Herbarium (UW–Stevens Point) — Asclepias exaltata species account
Minnesota Wildflowers — Asclepias exaltata (Poke Milkweed)
Illinois Wildflowers — Poke Milkweed
USDA NRCS Plants Database — Asclepias exaltata species profile
Ladies Bird Johnson Wildflower Center — Asclepias exaltata overview