Shoots growing beyond the one- to two-foot-wide hedgerow should be destroyed using a rototiller or spade. Follow the same pruning procedures as described for the summer-bearing red raspberries. This pruning option provides both a summer and fall crop. Prune all canes back to ground level in March or early April. Also, total crop yield is typically larger utilizing the one-crop system versus the two-crop system.
Maintain the plants in a 1- to 2-foot-wide hedgerow. The pruning of summer-bearing and fall-bearing yellow raspberries is identical to their red raspberry counterparts. Remove the small, weak canes, leaving only four or five of the largest, most vigorous canes per clump or plant. Cut back the lateral side branches to 12 inches in length for black raspberries and 18 inches for purple raspberries. When pruning is completed, remove the pruned material from the garden area and destroy it.
Work your way along the row, cutting out all the fruited stems right down at the base. It should be easy to spot these old stems, as they will be brown in colour and still carry the remains of the fruit stalks.
Take care not to damage the bright green new stems. Next, go back along the row and thin out any of the new stems that are overcrowded or weak, and remove any growing too far away from the row. Ideally the new stems should now be spaced about 20cm apart.
Finally, tie them in to horizontal wire supports. What about autumn-fruiting raspberries? Autumn-fruiting raspberries produce canes that flower and fruit in the same year. 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. This will discourage overgrowth and shading and will improve fruit production and quality. Completely prune back and remove all skinny, dead, damaged, diseased or otherwise weak canes. As your raspberry plants mature, it is recommended that you cut back the small, thin canes to leave only about 8 to 10 of the strongest ones.
Pruning Black Raspberry Plants Black raspberry plants have a slightly different growth habit, so pruning is slightly different as a result. When new shoots are 3 feet tall, prune off the tips. Tipping the canes stops the vertical growth and results in more vigorous side branching, where the fruit develops.
These lateral branches should be pruned so that they are kept at about 10 inches long. If one large crop is desired, cut all canes back to ground level after the fall crop. This will result in a single, large primocane crop the following fall.
My next mistake was leaving out something important — thinning the new canes when they come up in spring. The new canes are growing with a vengeance by the time you are picking raspberries, and there are usually too many of them. Pulling out about a third of the new canes — especially the earliest ones — keeps fresh air circulating around the ripening raspberries, and invites the canes that are allowed to grow to become husky and cold-hardy.
These big, vigorous brambles will only grow into heavy-bearing bushes if they are tip-pruned in summer by cutting off tips of the new canes when they are about head high. Pruning raspberries this way forces secondary or lateral branches to grow from nodes along the stem.
In my experience, the berries from these lateral branches are bigger and easier to pick than those from plants that receive no discipline until spring.
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