Lifting the crown of a tree (also known as crown raising) is the process of cutting off the lower branches of the tree.
There are several reasons why crown lifting is required
Most local authorities have a recommended height for clearance on street trees or trees that over hang pedestrian foot paths
In order to maintain the health of the tree a crown lift should be no greater than around 66% of the total height of the tree. In other words, if the height of the tree is 60ft, then the remaining crown after pruning should be around 40ft - this will ensure that the tree will continue to flourish.
When pruning is complete, the existing living crown should be at least two-thirds of the total tree height. Example: a 36 foot tree should have living branches on at least the upper 24 feet.
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