When topping the leaves are removed, which will affect the availability of food for the tree. This procedure also has a tree tissue remover, which contains a large amount of energy stores. With the energy that remains after the topping, the tree has to activate the latent shoots to form new branches and leaves. At the same time, those energy residues that will remain in the tree after topping will be used to keep the cells alive in the tree, including the roots.
It will require energy to heal the pruning wounds and to chemically defend against invaders such as pathogens. As we can see the topping weakens the tree. Although they can see vigorous trees usually survive, the reality is that we make them weak and more susceptible to data from insects and diseases if we top them more than once. Remember that you can kill a tree if you top a tree with a big stress problem.
