Pruning mature trees is a very different matter than pruning
younger trees. Mature trees are usually already formed and are pruned only for
specific reasons using specific techniques. Understandably, homeowners faced
with the task will have questions. Why prune mature trees? How to prune mature
trees? Read on for an overview on how and when to cut back mature trees.
When to Cut Back Mature Trees
Most young tree pruning is done to build a strong, stable branch
structure or to create a desired shape or form. On the other hand, the purpose
of trimming a mature tree usually involves size control and safety.
Trees that were pruned appropriately when young rarely
require major structural pruning. Weak branches have been removed and the
tree’s shape is balanced and pleasing. You may wonder then, why prune mature
trees at all?
Trimming a mature tree is usually done for one of three reasons: to thin the canopy to allow in sunlight, to raise the canopy to allow for foot or vehicle traffic below, or to make the tree canopy shorter. When performed improperly, pruning can make a mature tree unstable or harm its health and appearance.
Trimming a Mature Tree
Pruning mature trees requires more knowledge and skills than
pruning smaller trees. Anyone interested in learning about trimming a mature
tree needs to invest a little time and effort learning how.
A good rule of thumb is never to remove any live foliage from an adult tree unless you have a good reason to do so. That means that the first step in mature tree trimming is to determine exactly why you are pruning. That will dictate the type of cuts you will make.
For example, pruning to open up the canopy and allow in more
sunlight should not involve the removal of any big branches, only smaller
branches toward the canopy edge. Removal of large branches and older branches
often leads to decay.
How to Prune Mature Trees for Height
When you decide to get to work trimming your mature tree in
order to shorten its height do not even think of topping it. Topping
is very bad for a tree’s health, creates an unhealthy and unattractive branch
structure, and takes many years to “undo.”
Instead, reduce the crown by pruning out entire branches at
their points of origin from the trunk or another branch at least three times
the diameter of the branch removed. Make the cuts outside the branch collar,
the swollen area at the base of the branch. This helps the tree heal the wound.
How to Prune Mature Trees for Clearance
If you need more clearance under a mature tree to allow for
cars or foot traffic you need to raise the crown. Shortening or removing low
branches can raise the crown, but make sure you don’t take out too many.
Two-thirds of the total height of the tree must still have living branches.
If you need to take out thick branches, use a three-cut
pruning process.
- First, saw upward halfway through the branch a short distance from where it attaches to the trunk.
- Next, saw downward all the way through the branch farther out, removing the weight from the branch.
- Finally, make the last cut on the outside of the branch collar.
Pruning mature trees is a very different matter than pruning
younger trees. Mature trees are usually already formed and are pruned only for
specific reasons using specific techniques. Understandably, homeowners faced
with the task will have questions. Why prune mature trees? How to prune mature
trees? Read on for an overview on how and when to cut back mature trees.
When to Cut Back Mature Trees
Most young tree pruning is done to build a strong, stable branch
structure or to create a desired shape or form. On the other hand, the purpose
of trimming a mature tree usually involves size control and safety.
Trees that were pruned appropriately when young rarely
require major structural pruning. Weak branches have been removed and the
tree’s shape is balanced and pleasing. You may wonder then, why prune mature
trees at all?
Trimming a mature tree is usually done for one of three reasons: to thin the canopy to allow in sunlight, to raise the canopy to allow for foot or vehicle traffic below, or to make the tree canopy shorter. When performed improperly, pruning can make a mature tree unstable or harm its health and appearance.
Trimming a Mature Tree
Pruning mature trees requires more knowledge and skills than
pruning smaller trees. Anyone interested in learning about trimming a mature
tree needs to invest a little time and effort learning how.
A good rule of thumb is never to remove any live foliage from an adult tree unless you have a good reason to do so. That means that the first step in mature tree trimming is to determine exactly why you are pruning. That will dictate the type of cuts you will make.
For example, pruning to open up the canopy and allow in more
sunlight should not involve the removal of any big branches, only smaller
branches toward the canopy edge. Removal of large branches and older branches
often leads to decay.
How to Prune Mature Trees for Height
When you decide to get to work trimming your mature tree in
order to shorten its height do not even think of topping it. Topping
is very bad for a tree’s health, creates an unhealthy and unattractive branch
structure, and takes many years to “undo.”
Instead, reduce the crown by pruning out entire branches at
their points of origin from the trunk or another branch at least three times
the diameter of the branch removed. Make the cuts outside the branch collar,
the swollen area at the base of the branch. This helps the tree heal the wound.
How to Prune Mature Trees for Clearance
If you need more clearance under a mature tree to allow for
cars or foot traffic you need to raise the crown. Shortening or removing low
branches can raise the crown, but make sure you don’t take out too many.
Two-thirds of the total height of the tree must still have living branches.
If you need to take out thick branches, use a three-cut
pruning process.
- First, saw upward halfway through the branch a short distance from where it attaches to the trunk.
- Next, saw downward all the way through the branch farther out, removing the weight from the branch.
- Finally, make the last cut on the outside of the branch collar.