75 MAMMOTH GREY STRIPE SUNFLOWER Helianthus Annuus Flower Seeds BLOOM TIME: Early Summer - Early Fall HARDINESS ZONE: Annual PLANT HEIGHT: 108 - 144" . . . PLANT SPACING: 18 - 24" LIGHT REQUIREMENTS: Sun . . . SOIL / WATER: Average This sunflower has huge 10 - 13 inch flowers and its a tall one too! It attracts bees, butterflies, and birds.