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Pruning

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Pruning is the selective removal of specific plant parts, such as branches, buds, or roots. This practice is essential in horticulture, arboriculture, and silviculture. Professionals use pruning to remove diseased, damaged, dead, or structurally unsound material. It also targets non-productive or unwanted parts of a plant.

Arborist pruning Statue of Liberty
Arborist pruning Statue of Liberty

By removing these elements, gardeners and arborists improve the health and safety of the plant. A key principle is that smaller cuts are easier for a woody plant to manage. Plants use a process called compartmentalization to seal wounds and limit pathogen intrusion. It is often better to perform formative structural pruning on young plants. This avoids the need to remove large, poorly placed branches from mature trees later.

Understanding the anatomy of a tree is vital for precise pruning.

Labelled tree parts
Labelled tree parts

A tree consists of trunk wood, which is the main stem. Branch wood refers to individual stems growing off that main trunk. Where a branch attaches to the trunk, there is a union. This area includes the branch collar, which is the area below the union. It often appears raised on the stem. The branch bark ridge is the junction between the branch and the trunk. This area also usually looks raised. Pruners must avoid making "flush cuts." A flush cut occurs when a pruner accidentally cuts into the cambium layer of the main trunk. This removes part of the branch collar and risks allowing forest pathogens to enter the tree.

Pruning techniques can be simplified into two primary categories: reduction cuts and removal cuts. A reduction cut involves removing a portion of a growing stem. This is done down to a specific set of desirable buds or side-branching stems. This method can stimulate the growth of fruit, flowers, or new branches. It also serves as a preventive measure against wind or snow damage. In contrast, a removal cut involves completely removing a branch back to its union with the main trunk.

Prunedbushcloseup
Prunedbushcloseup

Another technique is thinning, which is a more drastic form of pruning. Thinning out cuts remove an entire shoot, limb, or branch at its point of origin. This is often used to revitalize a plant by removing excessive or weak growth. When done correctly, thinning encourages new growth that bears better fruit and flowers.

More severe methods include topping and crown lifting. Topping is the removal of all branches down to a few large limbs or the trunk. While it can be used to train very young trees for pollarding or espalier, it is generally discouraged. Topping disrupts natural structure and causes unpredictable growth. It can even create safety hazards by weakening branch attachments. Some cities actually prohibit tree topping because of these risks.

Crown lifting, or crown raising, involves removing lower branches to provide clearance. This is common in urban areas for pedestrians, vehicles, or buildings. However, lifting the crown should be restricted to less than 15% of the live crown height. If too many branches are removed, the tree can become top-heavy and unbalanced.

Specialized pruning is also used for specific goals like deadwooding and vista pruning. Deadwooding is the removal of dead branches to improve safety or aesthetics. Dead branches may die due to pests, disease, or sunlight deficiency. Removing them speeds up the tree's natural abscission process. This reduces unwanted weight and wind resistance. Vista pruning is the practice of selectively pruning a plant to maintain a specific view from a window.

The Employment of Women in Britain, 1914-1918 Q30959
The Employment of Women in Britain, 1914-1918 Q30959

This allows people to enjoy a landscape without the plants obscuring their sightlines.

Tools for pruning have evolved significantly over time. Older technology included billhooks, Kaiser blades, and pruning knives. While some are still used in coppicing, they are less common in commercial forestry. Today, workers use secateurs, loppers, and handsaws. In forestry, professionals often use pole pruners, also known as averruncators in British English. These are attached to poles that can reach up to 20 feet. Motorized versions, such as pole saws with chainsaws, are even more efficient. These tools allow workers to reach high branches safely without relying solely on ladders.

Nature also performs its own version of pruning through a process called cladoptosis. This is the natural shedding of twigs or branches that no longer produce enough energy. It may also occur when a plant lacks water. By dropping these parts, the plant reduces its surface area to prevent water loss. Human pruning works alongside these natural systems to manage growth and prevent decay.

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File:The Employment of Women in Britain, 1914-1918 Q30959.jpg
The Employment of Women in Britain,...
File:Labelled tree parts.jpg
Labelled tree parts.jpg
File:Arborist pruning Statue of Liberty.jpg
Arborist pruning Statue of Liberty.jpg
File:Prunedbushcloseup.jpg
Prunedbushcloseup.jpg
File:Pruning of trees in Chandigarh.jpg
Pruning of trees in Chandigarh.jpg
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