| This method is for pruning upright blackberries (not the trailing blackberries which grow on vines that lay directly on the ground); Tip (cut off the tips) of the new canes at a height of 24 to 30 inches to form branched canes. As growth starts, remove all dead and weak canes or branches and head (trim the top of) the branches back to a length of 12 to 15 inches or to the degree that the canes can support the expected crop. After the crop is harvested, remove the 2-year-old wood to stimulate the new canes and remove sources of diseases. KP, from WA, entered 1999-12-14 | 