These perennials usually remain in the 1 to 2 feet high range under most conditions. They are still low enough for the front of perennial border, garden, and landscape and some of the rhizomatous species will make low to medium height groundcovers. Their tidy habits also lend them to use as fillers and spillers for container specimens and in combinations for small to medium sized containers. Growing conditons and how well a plant is established may affect it's ultimate size.
Clusters of pure white flowers with a darker eye may be born throughout summer and can nearly cover the top of the plant under good conditions. White or Swamp Milkweed is one of the few shade tolerant Milkweeds but it seems to produce a fuller denser plant where it receives at least 4-6 hours or more of direct sunlight. This is an excellent choice for use as a Monarch host as it will remain evergreen in mild winters in zone 8B and warmer and is a good substitute for the Mexican Milkweed for those looking for a reliable locally native perennial Milkweed with a smaller compact habit. Asclepias perennis is native to much of the eastern central US. Provide a full to mostly sunny site in an average moist to semi-moist soil for optimum vigor and flowering. Plant the Aquatic or White Milkweed in spring until about midsummer in zones 6-8 to help ensure plants are well-established before winter. It can also be enjoyed as a container plant but it should be protected if there is a chance that the soil can freeze. Item# 10451