75 Days to maturity. Helianthus annuus. Starburst Sunflower Seeds: Non-GMO. Open Pollinated. Ornamental. Annual. Starburst F1 Hybrid is full-faced brown-headed sunflower perfect for gardens filled with sunshine! This pollen-less hybrid will mature in about 75 days from direct sowing. The perfect sunflower for any summer garden or kitchen table. Approximately 400 Seeds / Ounce.