80 Days to maturity. Helianthus annuus. Skyscraper Sunflower Seeds: Non-GMO. Open Pollinated. Ornamental. Annual. This sunflower is so tall you will need a big ladder to reach it, and even then you won't be able to reach the top! The yellow flowers are giant at 14 inches across. Can have single heads or many per stalk. Large edible seed. Heat and drought tolerant. Approx. 275 seeds/ounce.