Blackberry Thornfree The large, tasty blackberries are delicious eaten straight from the plant and are also excellent for Jam making and baking. The canes have almost no thorns, so you won't get scratched when picking the fruit. Blackberry Thornfree trains well and will produce heavy crops. Site: ShelteredSoil: AnyPosition: Full sun or partial shadePick: Late August–SeptemberKeep: A few days in the fridge; freeze wellHardiness: HardyPollination: Self-fertileUses: Eating, cooking, preservingHeight: 6' (2m) Spread: 6' (2m)