Answer: I think you have been pruning too hard for the once a year bearing type and thus causing a reduced (and split) yield . This type of raspberry is pruned based on the age of the canes. In late winter prune out all the canes that bore fruit the year before. Cut them off at the ground. In early spring, thin out the remaining canes to 3 or 4 per square foot. Leave only the best, most vigorous canes that are thick, have lots of fruiting nodes and have no signs of winter damage or insect damage. Finally, trim these good canes off at about four feet. Also, remember that the best fruit is produced when the plants are adequately fertilized and watered. Good luck with your raspberries!
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