Perennial. Invite monarch butterflies to your garden with the stunning blooms of this robust, shrub-like perennial. Also called Greek Milkweed, this species is drought tolerant once established and grows best in well-drained soils. Plants have green to silvery-green foliage and stems that are often soft and fuzzy. In summer, pink to white flowers are followed by decorative, woolly seedpods that are beautiful in dried arrangements. Native throughout much of the western United States. Deer resistant.