In an urban setting trees need to be pruned to mitigate risk from people and property. Without proper pruning trees can easily do damage to buildings, vehicles, and even people.
If pruned improperly however, the trees can become a higher risk than before. Through topping, lions tailing, and flush cuts thousands of trees are ruined every year by people who should not be hired to prune trees. Knowledgeable ISA Certified Arborist are the only to trust with your valued trees.