Proper pruning is essential in developing a tree with a strong structure and desirable form. Trees that receive the appropriate pruning measures while they are young will require little corrective pruning when they mature.
Each cut has the potential to change the growth of the tree. Proper technique is essential. Poor pruning can cause damage that lasts for the life of the tree. Trees do not heal the way people do. When a tree is wounded it must grow over and compartmentalize the wound. As a result, the wound is contained within the tree forever. Small cuts do less damage to the tree than large cuts. This is why proper pruning of young trees is critical. Waiting to prune a tree when it is mature can create the need for large cuts that the tree cannot easily close.