Tree Crown Reduction is the reduction of the overall shape of the tree, usually by no more than 30% can help make a tree safe.
This is done by reducing the mechanical stress on selected branches.
Crown reduction can also give a tree a more desirable shape and more suited to its immediate environment.
The reduction of a tree depends very much its species.
Different species are pruned according to the time of year, due to sap rising and risk of certain diseases.
The number of branches that can be removed from the tree depends on the species and circumstances in which the tree is growing, but on average between 20-30% of the photosynthetic area (crown area) can be removed.