Asclepias incarnata

Asclepias incarnata, the swamp milkweed, is a native perennial of outstanding ecological value for Martha's Vineyard's moist sunny garden areas, producing fragrant rose-pink flower clusters in July and August that are among the most critical monarch butterfly nectar sources and larval host plants active on the island during the late-summer migration staging period. It thrives in the moist to wet soils near freshwater ponds and in the rain-retaining areas of sunny garden borders throughout the island, tolerating periodic standing water with remarkable composure and adapting to the island's naturally acidic, sandy soils. Unlike the common milkweed, swamp milkweed maintains a refined, upright clump-forming habit that integrates naturally into more structured perennial border programs.

Deer largely avoid it. Estate Care professionals specify Asclepias incarnata as a signature plant in pond-edge and rain garden programs on island properties, recognizing its combined ecological value for monarchs and native bees alongside its genuine ornamental appeal.