If you have woody plants on your property that need to be maintained and cared for, hiring the correct arborist is the most important thing you can do. Choose the wrong arborists and chances are you could be in for some big headaches. This is because much of what an arboriculturist or arborist does has long lasting effects. Once a tree is wrongly cut or removed, that's pretty much it. There are no second chances and the damage caused may be irreversible. Cutting or removing branches, or parts of trees, improves the shape and growth of trees. Usually, trees are pruned as a preventative or corrective measure to remove dead branches, crowded or rubbing limbs. Pruning helps eliminate hazards and increase light and air penetration.