MAMMOTH GREY STRIPE SUNFLOWER is a HUGE plant and Flower. They can get 10 to 12 feet tall, but most get about 9 ft. They have huge leaves, and a thick, sturdy stalk that will produce a giant 12-24" feathery yellow flower with hundreds of seeds. The seeds are ready when the flower nods and drops its petals. Easy to grow from seed. Pretty much a carefree, drought tolerant plant once the seedlings are established. Water once or twice a week if no rain. Over-watering can cause disease. A little slow-release organic fertilizer will increase seed production. 50+ Organic seeds from Kansas per order. Thank You! helianthus annuus. Annual. Spring, soil temp 70F+. SOW 2 seeds per plant,1" Deep, about 3ft apart. Keep moist. Germination 7-10 Days. Thin to single best seedling. Use scissors to cut out unwanted seedlings. Height 8-12 ft x 3 ft wide. Medium water. Compost or organic slow-release fertilizer will increase seed production. Flowers are yellow. Blooms mid to late summer. Seeds are ready when flower nods. Buy Seeds Online,Organic Seeds,Heirloom Seeds,Non-GMO Seed,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