Boysenberries grow on low, trailing plants.[3] It is a large aggregate fruit with a deep maroon color, weighing 8 grams (0.28 oz) and containing large seeds.[3][4] The fruits are characterized... Thornless Boysenberry produces large, almost seedless fruits.Shipping Info. Description. PLANT SIZE: Approximately 8 to 12 inches tall, 1-year-old plant. BoysenberryPlantInfo. Boysenberries (Rubus ursinus × R. idaeus) are named after their creator, Rudolph Boysen. Boysen created the hybrid, but it was Walter Knott of Knott’s Berry... Want to know how to grow boysenberries? Check out our comprehensive guide for expert tips and tricks. Shop our selection of heirloom live plants to get started. A Boysenberryplant is a blackberry that is a cross between a raspberry and loganberry. This plant matures early and has excellent flavor. Thornless boysenberry canes produce 4-6 quarts per plant at maturity. The trailing canes grow 4-6 ft. tall. Boysenberries are harvested when the fruits drop from the vine at the slightest touch. When to PlantBoysenberry Canes. Boysenberry is a perennial plant that grows year round. Plants need a cool winter to produce fruit.More info on Australian climates zones here. How to Grow Boysenberries. Boysenberryplants need a full sun location, with six to eight hours of sunshine per day. Plants prefer an organically-rich, well-draining soil, with a pH of 6.0-7.0. CharacteristicsNew Thornless Boysenberry (Rubus) bushes fruits are ‘the pick of the bunch’ for healthy eating.Popular super fruit with loads of vitamins and antioxidants. Supply Division. Care & Planting Information.BoysenberryPlants. Boysenberries - Point of Sale Flyers. Boysenberry, a very large bramble fruit, considered to be a variety of blackberry (Rubus ursinus). Possibly a cross between a blackberry and a loganberry or red raspberry or both... Boysenberries are hybrids of raspberries, blackberries, dewberries, and loganberries. Sarah Jay will share the history of these berries and their care. Add sweet-tart boysenberries to your garden with this hardy vine. Ideal for zones 5-10, full sun, and trellis support. Produces fruit in 2-3 years. Boysenberries, an enticing amalgamation of raspberries, blackberries, and loganberries, captivate both gardeners and berry aficionados with their enticingly tart-sweet flavor.