How big do thornless blackberries grow?
Correspondingly, how tall do thornless blackberries grow?
Training and Trellising. Thornless blackberries grow to about 5 feet tall with an equal spread. Supporting your blackberry plant with a trellis allows air and sunlight to reach all parts of the plant.
Similarly, you may ask, do you need a trellis for blackberries?
Site Selection for Blackberry Bushes Soil: Prefer acidic to slightly basic (6.0-7.0), well-drained, organic soil. Plant blackberries 300 feet away from raspberries. Trellis Support Not Needed: 'Arapaho' blackberries do not need a trellis for support. However, they can be trained to a trellis no higher than 6'-8'.
Blackberries alone need the help of their surroundings to turn from tart to sweet. Macerating them with sugar, honey or even a sweet liquor adds the sweetness component. Put them into a bowl; add the sweetener, stir, and let them sit on the countertop and absorb.