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Pruning blueberries is essential in order to maintain their size, shape, and productivity. When blueberry plants are not pruned, they can become overgrown masses of weak, leggy growth with small fruit. However, severe pruning can lead to larger berries but fewer in number.n addition, prune out unproductive canes that have not produced any new growth. Generally for blueberry plant pruning, you should remove the two oldest canes each winter. In the first two years, adequate pruning will help train blueberry bushes into the most desired shape for promoting maximum fruit production.
A. If a late frost didn't kill the buds, the bushes may be suffering from too much bounty and too little pruning. If growing in the type of environment they love â acid soil, not too competition from weeds, full sun â blueberry bushes are very prolific berry producers.anes that are more than seven years old become less productive. To keep them producing well, blueberry bushes need to be pruned every year. 1  If your bushes have never been trimmed, be careful not to go overboard the first year: Remove no more than two or three of the oldest canes (more than seven years old).