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Sunflower Seeds - Mammoth Gray Stripe Common Name Sunflower Botanical Name Helianthus annuus Cycle Annual Color Yellow Height 96"-144"tall (8-12 feet) Origin Native Germination Time 10-20 days depending on soil and weather conditions. Planting Season Spring/ Fall Bloom Season Summer Light Requirements Full Sun, Mostly Sunny, Half Sun / Half Shade Soil Moisture Dry, Average, Moist/Wet, Well Drained Will Tolerate Sandy Soil, Loamy Soil, Clay Soil, Moist/Wet Soil, Drought/Dry Soil Ideal Growing Region All regions of North America Zones 1-10 Other Information Hedge / Screen, Showy Flowers, Extended Blooms, Easy to Grow