Crown thinning is the selective removal of secondary live growth from within a tree’s canopy, taking care to retain the framework branches that give the tree its structure. The aim is to produce an even canopy of foliage on a well structured set of limbs and branches that is typical for the species, without changing the overall shape or size of the tree. It is one of the most useful jobs in mature gardens across Chester and Cheshire.
When crown thinning is the right call
Thinning is the right answer when rooms or garden areas have gradually got darker over a number of years as the canopy filled in, or when a dense canopy is catching the wind and risking branch failure in storms. Properties like these benefit from a careful thin every few years rather than a one-off heavy intervention. The classic candidates are silver birch, sycamore, beech and cherry, all of which can develop a dense secondary growth that blocks light and air without obviously needing reduction.
Crown thinning is not the same as crown reduction. Thinning removes a percentage of the smaller branches throughout the canopy so light passes through, but the outline of the tree stays the same. Reduction makes the tree smaller. The two are sometimes combined where a tree needs both light and size brought back into balance, but they are distinct jobs and the right answer depends on what the property is trying to achieve.
How the work is carried out
Normally no more than 25 per cent of secondary growth is removed in a single operation, in line with British Standard practice for tree work. Crown thinning does not generally include the removal of inner lower branches from the central area of the crown; most pruning wounds are made in the outer quarter of the canopy, where the cuts heal cleanly and the natural form of the tree is preserved. In confined spaces certain constraints may result in the canopy having a slightly less symmetrical appearance after the work, but the tree’s health is the priority over a perfect outline.
The example below shows a silver birch in Chester that we thinned ready for the next year of growth. The before and after view gives a sense of the difference careful thinning makes: the tree looks like the same tree, just with more light coming through.
Tree Preservation Orders
Thinning work on a protected tree usually needs prior consent from the council. We check the TPO and conservation area position with Cheshire West and Chester Council or the relevant Welsh authority before quoting, and we submit the application paperwork on the owner’s behalf where consent is needed.
Credentials
ARB Approved Contractor, City and Guilds qualified, fully insured. The ARB Approved Contractor status is independently audited against the industry standard for tree work, which is particularly relevant for crown thinning where the technique decides whether the tree benefits or suffers.
Free no-obligation quote
For a free no-obligation quote on crown thinning anywhere across Chester, Cheshire and North Wales, call Daniel Gilfoyle on 07872 394 540 or 01244 314 065, or email info@absolutetreecareandgardens.co.uk. We come out, look at the tree, and confirm a written price and approach before any work starts.
