80 Days to maturity. Helianthus annuus. Organic Skyscraper Sunflower Seeds: Non-GMO. Open Pollinated. Ornamental. Annual. The skyscraper sunflower is beautiful and grows 12 feet tall with long, strong stalks holding the flowers up into the sky. As it looks upon the sky, the flowers are 14 inches in diameter. The petals are a soft yellow with an orange into green centers. The seeds are large and edible. Approximately 400 Seeds / Ounce.