84-105 days. Indian Summer rudbeckia seeds grow a seasonal spin to one of our country's most timeless, familiar, and award-winning blooms. Indian Summer has a wildflower habit and will thrive effortlessly if given space and plenty of sun. Indian Summer rudbeckia is an AAS Flower Winner and Fleuroselect Novelty Winner for being "a rapidly growing annual" with "huge blooms 6-9 inches across and makes a wonderful sunflower-like cut." Indian Summer rudbeckia seeds are known to tolerate gardens prone to heat and drought and are an ideal grow for kids or novice gardeners.