The best time to prune is after all severe winter weather has occurred and the plant is dormant. Typically, optimal pruning season occurs between January and March. Prune whenever dead, diseased and infected canes are found.
Pruning should be done each year, starting at the time the plants are set. Pruning should occur throughout the growing season to ensure overall healthy plants. Prune whenever weak or low-growing shoots sprout to prevent contact with the ground. Mature blueberry bushes require less maintenance. Pruning older blueberry bushes should occur whenever necessary to maintain the desired shape of the bush. The two oldest blueberry canes should be removed each winter. Do not excessively trim the bushes if they have never before been trimmed. Prune the bush to have a narrow base yet open top.