Seeds from this Very Rare Aristolochia tomentosa or Wooly pipe vine and is a larval plant for the pipevine swallowtail butterfly . Growing in part to full shade this twining, high climbing vine often grown to cover sun porches, verandas, pillars, posts, trellises, arbors, fences or walls and is capable of a height of 75 feet in trees. The greenish/yellow with purple blossoms covered with fine matted hairs are in bloom from May through June. Hardy in zone 5-9. Needs to be cold stratified for 90 days for good germination.