COMMON MILKWEED. Perennial.U.S.Grown seed. MILKWEED is the primary food plant of the monarch caterpillars. The monarch population has been decreasing by 50% a year for over ten years. The reason is no milkweed for the baby's to eat. Once established this plant requires very little care. Drought tolerant. One plant of Common Milkweed will form a large clump by its spreading rhizomes,which can be divided.This happens the second season and beyond. The lifespan of this perennial 4-5+ years. 50+ Quality heirloom seeds. I keep all milkweed seeds at 41F to help speed up germination.Thank You! Asclepias syriaca. Perennial. Full sun. Spring, soil temp 68F+. SOW on surface. Press into soil 6"apart. Do not cover. Needs light to germinate. Keep moist. germination 14-28 days. Thin to 18". Height 36" x 18" Wide.