Jul 27, Black or Purple Raspberry Bush Pruning. Remove fruiting canes after harvest. Tip prune new shoots in early spring 3 to 4 inches ( cm.) to encourage branching. Top these canes again 3 to 4 inches ( cm.) in summer. Then after harvest, remove all dead canes and those smaller than ½ inches (1 cm.) in diameter.
Raspberry plants are pruned by cutting back canes after they bear fruit. Cut back one-crop, summer-bearing raspberry canes as soon as the harvest is over. Cut these just harvested canes down to the ground.
Do not prune back new canes that have emerged during the summer. After the old, fruit-bearing canes have been cut back, train the new canes to a post or to one or two Estimated Reading Time: 3 mins. When to Prune Raspberry Plants. Once your raspberry plants have put on enough growth (which may not be until after their first year with you), aim to prune in the early spring, just as new growth emerges.
Prune young canes back until they are around 4 to 5 feet tall.
Aug 29, Black and purple raspberries are pruned three times a year: in the spring, summer, and after fruiting. The first pruning is done in early spring when lateral (side) branches are cut back to 8 to 10 inches in length. How to Trim Raspberry Bushes. Trimming, or ‘pruning’ plants means to cut them back, removing certain parts of the bush or tree. Sometimes it is also necessary to remove young buds, leaves, and shoots. The best time to prune raspberries is right at the beginning of spring, as new branches are starting to develop.