Swamp Milkweed is a great addition to wet sites, stream banks and butterfly gardens. Fragrant white-to-pink milkweed flowers appearing in July and August on tall, clump-forming plants. The flat cymes are followed by interesting seed pods. Asclepias incarnata is an important Monarch butterfly nectar source and is an important food source for the larval stage of Monarch butterflies. It tolerates dry sites as well as wet conditions.