Crown reduction involves only the outer part of the crown and therefore provides only a modest reduction overall height. This, combined with the accompanying decrease in sail area is often sufficient to mitigate all but the most severe types of hazard. The resulting wounds are usually quite near the tips of the branches and are therefore comparatively small. Crown reduction usually allows a high proportion of the foliage bearing structure to be retained.
Specification is in metres - eg : crown reduce by no more than 3m in height so that the tree is no lower than 14m in height and reshape ensuring that the tree retains a balanced and uniform shape.