Crown Thinning Removing branches from the crown of a tree without reducing the height or the spread. This prevents the tree from becoming too dense, stops the tree from casting too much shade and is a useful method for allowing more daylight into nearby properties whilst retaining the tree’s size. It also helps the wind to blow through a tree that may be susceptible to wind damage. Whilst crown thinning, we also remove any deadwood and defective branches. This is useful when a reduction is desired without wishing to alter the overall appearance of a tree.