The selective removal of plant parts, primarily branches, buds, leaves and flowers, to influence the development and health of woody plants (trees, shrubs). Pruning is a key part of tree care that, when performed properly, increases a tree’s safety and beauty, as well as the longevity of the landscape investment.
Most pruning is aimed at improving structure and reducing growth, which can help reduce the need for future removals, prevent disease or pest problems, repair storm damage or other issues, open vistas, or create clearance for structures and traffic. It can also be used to correct problems, such as rubbing or crossing limbs, water sprouts, and suckers growing from roots or trunks.
To prune effectively, it is important to understand why you are doing the work and how different cuts affect a plant. It is also important to use clean tools between pruning on different plants because diseases can be transferred from one cut to another.
Identifying problem limbs is the first step. Branches that are dead or dying should be removed as soon as they are noticed, regardless of time of year. These limbs are not only unsightly, but they can also lead to further decay or insect infestations. It is a good idea to remove the whole branch and not just a stub. This will allow the tree to compartmentalize the wound and limit the spread of disease or insects into living tissue.
Proper pruning technique is essential to good results and can be learned through training courses or working with a reputable arborist. In general, you should never remove more than one-third of the crown in any given season on deciduous trees and about 25 percent on evergreens. This will ensure that new growth has time to develop before the tree or shrub goes dormant in the fall.
Different goals call for different pruning techniques. Formative structural cuts are done on young trees and shrubs to shape them and guide their growth. This includes raising the center of a canopy to reduce wind resistance or shade and lightening the overall weight of the plant to increase the amount of sun reaching the ground. Pruning for size management typically shortens branches that are encroaching on power lines or extending over a home or driveway.
To remove large limbs, reduction cuts are made to a lateral branch that is at least one-third the diameter of the limb being removed. The lateral branch must be located higher up in the canopy to reduce the potential for water sprouts to grow from the site of the cut. When a lateral branch is used, it is important that the pruning cut is made at the point of attachment to the branch collar or bark ridge to avoid leaving a stub and to maintain the branch defense zone.
source https://ontimetreelopping.wordpress.com/2025/04/22/pruning-a-key-part-of-tree-care/
