90 - 110 days. Red Sun seeds grow one of summer's rarest and most unique blooms, stunning 60-72" tall branching sunflowers with eye-catching 5-6" heads of smokey burgundy, bronze, and copper. Red Sun sunflowers are grown for their rich, warm petals and chocolate-seeded centers that promise to keep the birds fed and coming back all season long. Red Sun seeds mature in as early as 90 days and make a quick and fun grow for novice gardeners to try out in the back of a garden. Red Sun sunflowers are hardy, easy to grow from seed, and thrive in many hot and drought-prone gardens across North America.