The original Boysenberry: a Rubus (caneberry) hybrid of uncertain origin cultivated and promoted by Walter Knott (eventually Knotts Berry Farm) near Anaheim, California beginning in the 1920s and 30s. Large, juicy, delicious, sweet-tart berries famous for jams and pies. Also wonderful fresh, especially when picked just right and consumed within a day or two. Vine-like, trailing, thorny growth habit. Generally more productive than the thornless selection. Early harvest. Self-fruitful. Zones 5-10.