Tree lopping is a term used to describe a process of reducing the height of a tree.  This practice can damage the health of a tree in a number of ways.  When a tree is lopped most of the foliage is removed which has the effect of temporarily starving the tree.  In response the tree will send out shoots from latent buds in an effort to restore its stability.  This forced rapid re-shooting is called epicormic growth.  A qualified arborist would never recommend this approach as this stresses and weakens the tree making it more vulnerable to pests and disease.  Fast growing epicormics can shoot up to six metres in some species but are not anchored as normal and are prone to breaking.  These will need pruning back in a few years or the tree itself will have to be removed because of its weakened state. If you are concerned about the size of your trees and they need reducing or removal, please call Family Tree Care to make a obligation free quote.