For ease of growing, this sunny perennial can't be beat! Plants start producing semi-double and double yellow blooms quickly in summer and continue to flower until fall frost. Care-free plants thrive in full sun and grow well even in heat, humidity, and poor or dry soils. A great plant for the wildflower or pollinator garden or perennial border. Exquisite combined with blue flowers. Long-lasting flowers are beautiful in fresh arrangements and bouquets.