HOW TO PRUNE BLUEBERRY BUSHES! There are a few different ways to prune blueberries, depending on what you want to achieve with your plants. But the most important thing is to prune each year after harvest. Pruning creates new wood where flower buds develop. Prune blueberries anytime after harvest, but before August 1 to ensure flower buds will have time to mature before the onset of fall and winter. Pruning is a stress on the bush, so keep them watered and fertilized to make sure they recover an