Proper pruning is essential in developing a tree with a strong stucture and desirably form. Trees that receive the appropriate pruning measures while they are young will require little corrective pruning when they mature.

Keep these few simple principles in mind before pruning a tree:
-Each cute has the potential to change the growth of the tree. Always have a purpose in mind before making a cut.
-Proper technique is essential. Poor purning can cause damage that lasts for the life of the tree. Learn where and how to make the cuts before picking up the pruning shears.
-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. For that reason, proper pruning (training) of young trees is critical. Waiting to prun a tree until it is mature can create the need for large cuts that the tree cannot easily close.

Taken form ISA Trees are Good