Tropical Milkweed, Bloodflower Asclepias curassavica Asclepias curassavica seeds do not need to be cold stratified (since it is a tropical plant). You can start these indoors about 4-8 weeks before the last frost. Plant the seeds about 1/4 inch deep and keep moist. They will germinate in about 2-3 weeks. SEED TYPE: Heirloom Seed ALSO KNOWN AS: Tropical Milkweed, Cotton Bush, Mexican Butterfly Weed, Scarlet Milkweed Grow Heirloom Bloodflowers / Sunset Flowers - Plant Bloodflower / Sunset Flower Seeds Bloodflower (Asclepias curassavica) is a perennial in zones 9-10 and warm season annual in other zones. Buy Seeds Online,Organic Seeds,Heirloom Seeds,Non-GMO Seeds,Vegetable Seeds,Flower Seeds,Herb Seeds,Fruit Seeds,Garden Seeds,Seed Starter Kits,Rare Seeds,Bulk Seeds,Indoor Gardening Seeds,Seed Catalog,Seed Packs for Sale,Sustainable Seeds,Greenhouse Seeds,Seed Suppliers,Planting Seeds,Home Garden Seeds