Asclepias incarnata Native to the eastern US, this resilient milkweed is tolerant to both boggy and well-drained soils. The clumping plants reach 3–4 feet tall, topped with fragrant pink flower clusters. An excellent choice for attracting pollinators to rain gardens and stream sides. Hardy in zones 3–6. Approximately 200 seeds per gram. Germination code: (1) or (4)