To encourage the plant to put it's energy into growing productive side-shoots, cut the tip off each cane in the summer. This should be done when the plant reaches a height of 2 -4 feet. After harvest, cut out the canes that have produced fruit and choose 6-9 large, straight canes on each plant to save for next year. Prune back the side branches on these canes to 8-12 inches and remove spindly ones. Blackberries Blackberries are usually left to grow along the ground the first year.
Fruit is borne on second-year canes.
Prune spent canes off immediately after harvest. In very early spring, thin to the best 6-9 canes per hill, and cut these canes to a length of about 7 feet. Tie these canes along the trellis. Add our channel to your Pocket PC, Palm, or other wiresless device.