25 INDIAN BLANKET SUNFLOWER Helianthus Annuus Flower Seeds BLOOM TIME: Late Summer - Fall HARDINESS ZONE: Annual PLANT HEIGHT: 48 - 60" . . . PLANT SPACING: 15 - 18" LIGHT REQUIREMENTS: Sun . . . SOIL / WATER: Average Rush, Deep Red, Gold, and Dark Yellow Mixes. The Indian Blanket Sunflower has 4 inches flowers. It is similar to the Autumn Beauty Sunflower but has deeper darker shades. Attracts bees, butterflies, and birds.