Swamp Milkweed

The 2005 North Carolina Botanical Garden Wildflower of the Year, Asclepias incarnata (Zones 3–9,) is a refined, sophisticated perennial for the modern native landscape. Growing in an upright, 3–5' architectural mound, it maintains a disciplined and stable form that makes it a reliable anchor for garden design. In mid-summer, it produces fragrant, vanilla-scented clusters of deep pink to mauve flowers that serve as the visual and aromatic centerpiece of the meadow.

This is a high-capacity Lepidopteran Host and a premiere nectar hub. While it is a critical nursery for Monarch caterpillars, its leaves are smoother and more succulent than other milkweeds, making it a preferred choice for egg-laying. Beyond the Monarch, its high-sugar nectar supports a massive diversity of Great Black Wasps, Tiger Swallowtails, and native bees.

Performance & Site Care

In the Southeast, A. incarnata acts as a high-performance Stormwater Buffer. While found in marshes and along stream banks in the wild, it is surprisingly sophisticated in its adaptability to residential landscapes. It is a Clay Specialist that thrives in heavy, poorly drained areas where other plants fail, yet once its root system is established, it performs with remarkable resilience in average garden soils. It is the ideal solution for rain gardens or low spots that experience "pulse" flooding during NC summer storms. It requires full sun to maintain its rigid, upright form and prolific bloom cycle; in too much shade, the stems may lean toward the light.