Apple trees should be pruned yearly, each winter when the tree has dropped all of its leaves for the winter, usually November to early March. You want to remove around 10-20% of the overall canopy, evenly and this should only consist of around 10-20 cuts. Remember that around 10-20% of the canopy and 10-20 cuts in total. This idea is to remove some the previous year's growth but leaving plenty of growth that is 1-5 years old as these produce the best fruit.
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