Outsidepride Butterfly Milkweed Asclepias Tuberosa Hello Yellow Plant Seed - 50 Seeds Butterfly Weed Hello Yellow or Butterfly Milkweed grows as a perennial in USDA Zones: 3 - 8 and thrives in full sun. Asclepias Tuberosa grows up to 24 inches tall and has bright yellow blooms from summer through fall that make beautiful cut flowers. This hardy plant is heat, drought, and cold tolerant. It also attracts butterflies, especially Monarch butterflies and is deer resisant. Sow these heirloom seeds at 2 seeds per plant in well-drained soil and keep moist until germination occurs in 28 - 42 days. Our seeds are always Non-GMO and packaged for the current year.