A lush green garden is quintessentially English, and our style of gardens spread throughout continental Europe over two centuries ago to become the predominant style. Part of its informal style gives it charm. From the green grass on gently sloping terrain to the cosy tree groves dotted throughout, it’s a style that can be replicated in small private homes just as it can be adopted in traditional English country estates.
Keeping a healthy green garden requires plenty of natural sunlight, however, which can sometimes be blocked out by dense canopies of foliage from your garden’s trees. Of course, some shade is necessary, but too much blocked sunlight can prevent vegetation below the tree from growing, reduce photosynthesis from the trees’ inner branches, and dense tree canopies can also create too much wind resistance which can be hazardous.
That’s where tree crown thinning can help. Tree crown thinning is essential for keeping dense tree canopies under control and managed, all whilst prioritising the health of the tree and the safety of anyone enjoying the garden and passing underneath.
What is crown thinning?
Crown thinning is a type of crown reduction service provided by tree surgeons and arborists in the UK. It involves tree pruning, specifically the removal of lighter inner branches and leaving the tree’s crown more or less the same shape and size.
By removing dead or diseased branches and pruning away small competing branches that cross or rub against one another, the tree’s crown will be left healthier, lighter, and offer all of the desired benefits.
What are those benefits? Aside from the health benefits of pruning away deadwood or otherwise unhealthy or diseased branches, as is the case with tree pruning in general, crown thinning helps improve air circulation throughout the crown and allows for greater light penetration.
Why are dense tree crowns bad?
A dense tree crown might not seem like much of a problem at first glance, but it can be unhealthy for the tree and for any vegetation underneath, like lawns or flowers. When a tree’s crown is too dense with foliage, the outer layer gets all of the sunlight and much of it fails to make it to the inner leaves and to grass or flowers underneath the tree’s canopy. This results in poor photosynthesis, which in turn leads to stunted growth, higher risks of attracting diseases, attractive locations for pests to hide, and can contribute to killing the tree.
Moreover, a dense crown might be more than the tree’s root system can support safely, especially during stormy weather with strong winds. The crown may sway excessively as it catches all the wind like a sail, which can result in cracked branches or even a split trunk. Naturally, this poses a hazard for people and property underneath.
If you’ve noticed patchy spots of grass underneath your tree, weeds sprouting up around the tree, or that the tree’s crown is much thicker than it should be, it could be a sign that it needs crown thinning.
Why crown thinning is healthy for dense tree crowns
As you might have already guessed, tree crown thinning is great for resolving the aforementioned problems. Thinning out the crown reduces its overall weight whilst still retaining the same shape and size overall. This makes it more structurally stable and balanced with its trunk and root system.
Thinner crowns will still catch wind, but they’ll let a lot more pass through. This means that they’re more stable in stormy weather. The increased light penetration is also beneficial for any vegetation underneath and for ensuring that the majority of the tree’s foliage gets adequate sunlight.
Some little side effects that are also nice include more abundant and healthy natural growth of fruit and flowers, regrowth of preferred branches with healthy new branches, and the removal of deadwood and diseased wood. A healthier tree is also much less likely to be prone to pests and diseases.
Furthermore, the tree will look better and more natural, and it can offer you more sunlight for your garden patio or outdoor lounge area, more light making it to your windows and into your home, and a safer habitat for beautiful birds and other wildlife who may want to call your tree home.
How does tree crown thinning work?
Crown thinning is a specific service that most reputable tree surgeons and arborists in the UK provide to customers, whether they be private homeowners, for commercial properties, public parks or utilities. As with all pruning, it’s always recommended to prune less rather than more, and pruning cuts should always be done in accordance with established standards such as BS 3998 and never with broad, reckless cuts aka ‘tree lopping.’
Pruning cuts are made to interior, tertiary branches, removing dead, diseased, or crisscrossing branches. Some exterior crown branches might be ideal to remove too, but the purpose is to gradually thin out the inner part of the crown whilst maintaining its overall shape and size.
Depending on the tree species, the best time to prune may vary quite a bit. For most deciduous (leafy) trees, winter is healthiest or early spring before the regrowth season begins anew. Getting the timing right is essential, so always make sure you ask a qualified arborist about the ideal pruning season for your tree.
What’s the difference between crown thinning and other tree pruning methods?
Crown thinning is one of many methods of tree pruning, so you may be wondering what other options are out there for improving tree health. If the goal is to improve garden light and boost tree health and the tree’s crown is dense, crown thinning may be the best option for you.
Here are some of the most common tree pruning methods compared:
| Tree Pruning Method | Primary Goal(s) | End Result for Tree |
| Crown Thinning | ● Improve light penetration
● Reduce wind resistance |
Crown is thinner, less dense |
| Crown Lifting/Raising | ● Remove lower branches from canopy
● Create clearance underneath tree canopy |
Crown is visibly higher up the trunk |
| Crown Reduction | ● Reduce overall crown size
● Improve structural stability |
Smaller crown overall |
When performed by a qualified tree surgeon in the UK, all tree pruning methods listed above will aim to keep the tree healthy. This is one of the primary goals of the arboriculture industry in the UK, and best practices dictate that preserving and improving tree health are essential whenever possible. This means that your tree surgeon should be removing deadwood, pruning away diseased or dangerous branches, and ‘cleaning up’ the crown by selectively pruning.
How to get tree crown thinning near you
Proper tree care and maintenance can go quite a long way in keeping your entire garden green and healthy. Trees with dense crowns often need crown thinning to remain structurally sound, healthy, and to increase light penetration and reduce wind resistance.
When you need a tree surgeon or arborist near you to thin out your tree crown, look no further than TreeMend.
