For proper pruning, a thorough biological undertanding of trees and their structure is required. Many tree maintenance procedures are common but pruning is one of the most important. Wild trees growing in the forest can grow very well on their own but your trees are living in an urban landscape and here they need more attention to maintaining their natural beauty, shape and structural form. An improper pruning procedure can destroy the tree and ruin its life. Pruning is a process of selectively removing dead or unhealthy branches, as well as those that cross or interfere with other branches, wires, structures, etc.This is the most important thing you can have done for your trees.