84-91 days. Blanket Flower gaillardia seeds promise a vibrant and perennial touch of authentic American color in your garden. Blanket Flower seeds grow herbaceous 18-36" tall bushy uprights boasting well-stemmed 3" sunburst blooms. Gaillardia is native to the dry and demanding summers of North America from Canada down into the American southwest. Blanket Flower seeds are self-seeding and ideal among beddings, rock gardens, and any open woodland spaces.