Grows vigorously under almost any circumstances. Large roughly hairy dark green leaves are followed by a profusion of blue/purple flowers in early to late summer. Contains allantoin, used in many skin and beauty preparations. The mucilaginous leaves are rich in vitamins, minerals, protein, and are raised as fodder. Internal use by humans is now discouraged because of the presence of pyrrolizidine (liver-toxic) alkaloids. This is a sterile non-seeding variety of Comfrey.