Week of November 29, 2017
Blackberries have three possible growth habits—erect, semi-erect or trailing. The way to train and prune them will depend on the type. Dormant pruning of erect blackberries entails removing dead canes and cutting back laterals to 12–18”. Semi-erect blackberries should be thinned to 5 to 8 of the strongest canes and shorten the laterals to 12–18” and remove any growing on the lower 3’ section of the main canes. Tie to a fence or trellis to provide support. Trailing blackberries are less cold tolerant and in cold regions the canes can be left on the ground and protected with rowcover over the winter. In spring the canes can be lifted and tied to a trellis at 3’ and 6’.