Pruning raspberries is important to open up the plant, make room for new growth, and encourage fruit production. You want about a dozen canes per plant when you are done. First, go through and remove all dead, dry, brittle canes. Next take out the canes to the ground that don’t look healthy or vigorous. Prune any lateral canes that cross through the center of the plant. Trim off the top of any canes that has already bore fruit–cut just below the part that is already dead to encourage the lateral canes to bear next season. When you’re done, gently tie a few of the canes to the treliss to keep your raspberry plants upright.