What is Crown Raising?
Crown raising, also known as crown lifting, is a pruning technique used to increase the clearance between the ground and the lower branches of a tree’s canopy. This method involves the selective removal of the lower branches to elevate the canopy’s height, allowing for more space beneath the tree.
Crown Raising: Key Points
Purpose
Clearance: Crown raising is often done to provide clearance for pedestrians, vehicles, buildings, or other structures beneath the tree. It’s commonly used along streets, in parks, or near buildings to prevent lower branches from obstructing pathways or causing hazards.
Aesthetics: Raising the crown can enhance the visual appeal of a tree by making its trunk more visible and creating a cleaner, more open space underneath. This can improve sightlines in landscapes and highlight the tree’s form.
Light and Space: This technique can also be used to allow more light to reach the ground below, which can benefit understory plants, lawns, or other landscaping elements.
Technique
Crown raising involves the careful removal of lower branches or parts of branches. The goal is to raise the canopy without compromising the tree’s health or structural integrity.
Typically, no more than one-third of the tree’s total leaf area should be removed during any single crown-raising operation to avoid excessive stress on the tree.
Cuts should be made at the branch collar to allow for proper healing and to minimize the risk of disease or decay.
Timing
Crown raising can be done at any time of year, but it is generally best to perform major pruning tasks during late winter or early spring when the tree is dormant. This timing reduces the stress on the tree and allows for quicker recovery.
Light pruning for clearance purposes can also be done during the growing season if needed.
Considerations
Care must be taken not to remove too many lower branches at once, as this can destabilise the tree, making it more vulnerable to wind damage or reducing its ability to photosynthesize effectively.
It’s important to maintain a balanced canopy after crown raising to prevent the tree from becoming top-heavy or uneven, which can lead to future problems.
Crown raising is particularly useful for trees in urban areas where space is limited, or where there is a need to allow for foot or vehicle traffic underneath the canopy. It is suitable for many types of trees, though it should be applied cautiously to younger trees to avoid excessive removal of essential foliage.
Crown raising is a practical and aesthetic pruning technique that helps manage the spatial relationship between trees and their surroundings. When done correctly, it ensures the safety and usability of the space beneath the tree while preserving the tree’s health and natural form.