Asclepias tuberosa is a long blooming perennial with bright orange flower clusters that attract butterflies. Commonly referred to as Butterfly Weed, this perennial's leaves are a larval food source for monarch butterflies. Asclepias tuberosa forms a tap root so it resents transplanting once established. Butterfly Weed is native to all but the northwest United States. Asclepias is late to break dormancy in the spring. Deadhead this plant to encourage rebloom.