TreeZone Ltd

North Shore Arborist

0800 99 66 06

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Why TreeZone does not recommend Tree Topping

Starvation

Good pruning practices rarely remove more than ¼ to ½ of the crown, which in turn does not seriously interfere with the ability of a tree’s leafy crown to manufacture food. Topping removes so much of the crown that it upsets an older tree’s well-developed crown-to-root ratio and temporarily cuts off its food-making ability.

Shock

A tree’s crown is like an umbrella that shields much of the tree from the direct rays of the sun. By seriously removing this protection, the remaining bark tissue is so exposed that scalding may result. There also maybe a dramatic effect on neighbouring trees and shrubs. If these thrive in shade and the shade is removed, poor health or death may result.

Insects and Disease

The large stubs of a topped tree provide an entrance point for disease. The terminal location of these cuts, as well as their large diameter prevent the tree’s natural defence system from doing its job. These stubs are highly vulnerable to insect invasion and the spores of decay fungi. If decay is already present in the limb, opening the limb will speed the spread of the disease.

Weak Limbs

At best, the union of a new limb that sprouts after a larger limb is shortened is weaker than a limb that develops normally. If rot exists or develops at the severed end of the limb, the weight of the sprout makes a bad situation even worse.

Rapid New Growth

The goal of topping is usually to control the height and spread of a tree. Actually, it has the opposite effect. The resulting sprouts (often called water sprouts) are far more numerous than normal growth and they elongate so rapidly that the tree returns to its original height in a very short time – and with a far denser crown.

Tree Death

Some trees are less tolerant to topping than others. Beeches, for example do not sprout readily after severe pruning and the reduced foliage most surely will lead to death of the tree.

Ugliness

A topped tree is a disfigured tree. Even with its re-growth it never regains the grace and character of its species.

Cost

To a worker with a saw, topping a tree is much easier than applying the skill and judgement of good pruning. Therefore, topping may cost less in the short run. However, the true costs of topping are hidden. These include: reduced property value, the expense of removal and replacement if the tree dies, the loss of other trees and shrubs if they succumb to changed light conditions, the risk of liability from weakened branches and increased future maintenance.

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Tree Maintenance
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