Last updated: March 28, 2026 | By Carlos Mendez, ISA Certified Arborist
Proper pruning is both an art and a science. Done correctly, it improves tree health, enhances appearance, increases light penetration, and reduces the risk of branch failure. Done incorrectly, it can weaken the tree, create entry points for disease, and actually increase hazard potential. Here are the techniques professional arborists use to prune trees properly.
📋 In This Article
Understanding Why We Prune
Every pruning cut should have a specific purpose. The main reasons for pruning include removing dead, dying, or diseased branches to prevent decay from spreading; eliminating crossing or rubbing branches that cause wound sites; improving structure by removing competing leaders or poorly attached branches; increasing light and air circulation through the canopy; raising the canopy by removing low branches for clearance; and reducing risk by removing branches that could fail and cause damage.
Before making any cut, ask yourself: why am I removing this branch? If you cannot articulate a clear reason, leave it alone. Every cut is a wound, and unnecessary wounds stress the tree without providing benefit.
The Three-Cut Method
For any branch larger than about 2 inches in diameter, the three-cut method prevents bark tearing and produces a clean wound that heals properly:
- Undercut: Make a cut on the underside of the branch, 12 to 18 inches from the trunk, cutting about one-third of the way through. This cut prevents the bark from peeling down the trunk when the branch falls.
- Top cut: A few inches farther out from the undercut, saw through the branch from the top. The branch will break cleanly between the two cuts, removing the weight.
- Final cut: With the branch weight removed, make the final cut just outside the branch collar — the slightly swollen area where the branch attaches to the trunk. Cut at a slight angle parallel to the branch collar, not flush with the trunk.
The branch collar contains specialized cells that seal the wound. Cutting into it (flush cutting) destroys this tissue and dramatically slows healing. Leaving a long stub prevents the collar from closing over the wound and creates a dead projection that invites decay.
Thinning vs Heading Cuts
Thinning cuts remove an entire branch back to its point of origin — where it connects to another branch or the trunk. Thinning maintains the tree natural form, allows light into the canopy interior, and does not stimulate excessive regrowth. This is the preferred pruning technique for most situations.
Heading cuts shorten a branch by cutting it to an arbitrary point (not at a branch junction). Heading stimulates dense regrowth just below the cut, often producing clusters of weakly attached sprouts. Avoid heading cuts on large branches — they destroy natural form and create future problems. Heading is acceptable only on small branches when shaping young trees.
Crown Thinning
Crown thinning selectively removes branches throughout the canopy to reduce density. The goal is to allow more light and air to penetrate while maintaining the tree natural shape. A proper thinning removes 15 to 25 percent of the crown at most — removing more stresses the tree excessively. Thinning cuts should be distributed evenly throughout the crown, not concentrated in one area. The result should look natural, as if no pruning occurred — just a lighter, more open canopy.
Crown Raising
Crown raising removes lower branches to provide clearance for pedestrians, vehicles, buildings, or sightlines. Remove limbs gradually over several years rather than all at once — maintaining at least two-thirds of the tree height as live crown. Removing too many lower branches at once exposes the trunk to sun damage and shifts the tree center of gravity, increasing wind resistance in the upper crown.
What NOT to Do
Topping — cutting the main trunk or major branches back to stubs — is the single worst thing you can do to a tree. Topping removes a massive percentage of the tree leaf area, triggers explosive growth of weakly attached sprouts, creates large wounds that cannot heal properly, destroys the tree natural form permanently, and actually increases long-term hazard because the resulting growth is more likely to fail than the original branches. No reputable arborist will top a tree. If a company suggests topping, find a different provider.
Proper pruning is an investment in your tree long-term health and your property safety. Our certified arborists at Landscaper Team use science-based pruning techniques that keep trees healthy, beautiful, and structurally sound. Contact us for professional tree pruning.