Swamp Milkweed

Swamp Milkweed

Asclepias incarnata

A beautiful native milkweed with elegant clusters of rose-pink flowers that bloom in mid to late summer. Swamp Milkweed is one of the most reliable and garden-friendly milkweeds, attracting large numbers of butterflies, bees, and other pollinators while remaining well-behaved in planted landscapes.

The fragrant flower clusters stand atop tall upright stems with narrow leaves, creating graceful vertical structure in wetlands, rain gardens, and moist meadow plantings.

The Pollinator Magnet

Swamp Milkweed is an essential plant for supporting monarch butterflies. Female monarchs lay their eggs on the leaves, and the emerging caterpillars feed on the foliage as they grow. The plant’s nectar-rich flowers also attract many other butterflies, native bees, and beneficial insects throughout the summer.

Compared to other milkweed species, Swamp Milkweed grows in tidy clumps and spreads slowly, making it ideal for gardens and restoration plantings.

A Wildflower of Wet Meadows and Marsh Edges

Swamp Milkweed grows naturally in wetlands, wet meadows, stream banks, and marsh edges where soils remain moist. It adapts well to garden conditions and thrives in rain gardens or areas that receive occasional standing water.

Its deep root system also helps stabilize soils and improve habitat for beneficial insects.

Growing Information

Height: 3–5 ft

Spread: 2–3 ft

Light: Full sun to part sun

Soil: Moist to wet soils

Hardiness: Zone 3–9

Growth Rate: Moderate

Best planted in rain gardens, wet meadows, pond edges, pollinator gardens, and naturalized landscapes.

Ecological Importance

Swamp Milkweed:

Essential host plant for Monarch Butterfly caterpillars

Provides abundant nectar for butterflies and native bees

Supports a wide variety of beneficial insects

Strengthens wetland and meadow ecosystems

Larval host for
• Monarch Butterfly (Danaus plexippus)
• Milkweed Tussock Moth (Euchaetes egle)
• Milkweed Leaf Beetle (Labidomera clivicollis)

Associated Wet Meadow Species

Common companions in natural wet meadow and wetland plant communities include:

• Blue Flag Iris (Iris versicolor)
• Joe Pye Weed (Eutrochium maculatum)
• Boneset (Eupatorium perfoliatum)
• New England Aster (Symphyotrichum novae-angliae)
• Cardinal Flower (Lobelia cardinalis)
• Blue Vervain (Verbena hastata)
• Culver’s Root (Veronicastrum virginicum)

Planting these species together helps recreate resilient wetland habitats that support pollinators, birds, and beneficial insects.

Planting to Protect
Restoring to Thrive ?
Origin Native Plants ?

3.5 inch Pots