91-105 days. Green Wizard rudbeckia seeds grow one of summer's most unique and exclusive blooms boasting 3-5 inch black 'rayless' coneflowers. Green Wizard seeds are an exciting and fascinating substitute in the flower bed for the traditional golden yellow rudbeckia. Green Wizard rudbeckia seeds are an ideal grow amongst wildflower mixes, untamed meadows, and wide open spaces. Green Wizard rudbeckia is native to the wet, high mountainous regions of the American west and is a vigorous performer in cool, moist, yet sunny gardens.