A selected variety with golden yellow flowers all summer. Easy to grow perennial to 18 inches high, full sun, regular water. Attracts the monarch butterfly. This species grows year-round in warmer climates, unlike North America's native species. Because a tiny parasite that harms monarch butterflies may overwinter on this tropical milkweed, it is advisable to cut it down in winter to let it regrow clean foliage. USDA zones 8 - 11. Summer annual elsewhere. Native to tropical America.