'White Swan' is not as cold hardy or vigorous as its common purple relative, but it makes up for this with its unique, beautiful, pure white flowers. A tall plant with large, dark green leaves and a large, 3-4" flower with white, broad, silky petals that surround a dark brown/bronze cone. Plants are tough and heat and drought tolerant once established. Their roots have famous medicinal qualities, they make great, long lasting, cut flowers and attract numerous butterflies and small birds.