Common Name(s): Green Milkweed, Green-flowered Milkweed, Spider Milkweed Botanical Name: Asclepias viridis Type: Perennial Hardiness: USDA zones 5 to 9 Light Requirements: Full sun Water Requirements: Average to low Bloom Color(s): Green and purple Bloom Period: Late spring to summer Height: 24 to 30 inches Spacing: 18 to 24 inches Features: Showy blooms, attracts butterflies Precautions: Does not transplant well Seeds per packet: 15