Plant swamp milkweed in full sun to partial shade. Choose a location with moist, well-drained soil. Space plants 18-24 inches apart. Water regularly to maintain consistent moisture, especially during dry spells. Fertilize lightly in early spring with a balanced fertilizer. Cut back stems to the ground in late fall or early spring to encourage new growth. Monitor for pests like aphids and treat as needed. Swamp milkweed attracts butterflies, especially monarchs, and can tolerate occasional flooding, making it ideal for rain gardens or wetland areas.