Reducing canopy size stresses the tree because of the cuts required. Unlike a thinning cut, a drop-crotching cut does not cut back to a natural boundary, this means that decay can spread quickly inside cut branches.
Crown Reduction is a pretty severe method of pruning trees. It can stress the tree due to the cuts required, unlike a thinning or drop-crotching cut, which doesn’t cut back the natural boundary. The potential hazard of a crown reduction is the spreading of decay inside the cut branches.
Crown reduction can be used for the following reasons:
- The need to reduce weight of potential dangerous limbs
- To re-balance of a lop sided storm damaged tree
- To make sure trees do not obstruct or damage buildings and property.
- If the tree is interfering with overhead telephone and power lines.
The right methods of prevention
Over pruning can create decay in the trunk or branches and stimulate rapid epicormic growth that fills in the canopy as it quickly grows to it’s original size.
It is sometimes more appropriate to removal the tree altogether and replace with new planting, although Crown reduction can be an answer, it is also a preferred method to topping.
If a tree is structurally sound this method shouldn’t be used in storm prevention, and we would favour crown thinning as a preferred route to minimize potential storm damage.
Crown reduction could also be considered when the root system of a large mature tree is dramatically decaying, again rendering it a potential hazard to people and property
Crown reduction can be time consuming and requires the expertise of a professional tree surgeon so not to damage the health of the tree.
One thing to remember is a tree will always revert back to its normal size.