Perennial – blooms appear in the second season and will reappear for many years to come. 60" tall. Although Poke Milkweed is a long-lasting perennial, it does not spread as aggressively as other asclepias varieties. This makes it a smart option for smaller landscapes and more manicured gardens. Poke Milkweed is a habitat and food source for Monarch butterflies, moths, and other fascinating pollinators in your region. Like all milkweed grown from seed, this variety needs a cold period in order to germinate and is best planted in the fall or forced into cold stratification for spring seeding.