Boysenberry, a trailing plant closely related to the blackberry. It bears large, reddish-black berries. Boysenberries are sold fresh, frozen, or canned and are used in preserves, ice cream, and yogurt. The plant has compound leaves and small white flowers. It is propagated by rooting stems, or canes. The prickly canes grow to 10 feet (3 m) long. The boysenberry plant is grown commercially from Oregon to southern California. It was named for Rudolf Boysen, an American horticulturist, who helped develop it.
The boysenberry is a hybrid of several species of the genus Rubus of the rose family, Rosaceae.Boysenberries are large red-black fruits related to blackberries.