Mammoth Grey Stripes Sunflower Seeds - Heads up to 20" Across Approximately 50 Seeds of Mammoth Grey Striped Sunflower Seeds, Non-GMO, Neonicotinoid-free Plant 1" Deep in Spring (2' in Sandy Soil) Heads up to 24" and Plants are 8-12' Tall 100 -110 Days Until Bloom After Planting Marde Ross & Company has been a licensed California Nursery since 1985