Mammoth Grey Stripe Sunflower is a mammoth of a sunflower, boasting huge blooms of almost 12 inches across on stems 8-12 feet tall! Harvest some grey-striped sunflower seeds for toasting and snacking in the Fall. An exciting sunflower to watch grow! Species: Sunflower, Mammoth Grey Stripe Sunflower Type: Flower Seeds Sunlight: Full Sun, Partial Shade Days to Germination: 7 - 14 Days to Bloom: 100-125 Seeds Packed For: 2022 Height: 8-12 ft Germination Rate: 85% Test Date: 12/21 Country/Region of Manufacture: United States