Specific types of pruning may be necessary to maintain a mature tree in a healthy, safe, and attractive condition.CleaningThe removal of dead, dying, diseased, crowded, weakly attached and low-vigor branches from the peak of a tree.Thinning The selective removal of branches to increase light penetration and air movement through the crown. Thinning opens the foliage of a tree, reduces weight on heavy limbs, and helps retain the trees natural shapeRaisingremoves the lower branches from a tree in order to provide clearance for buildings, vehicles, pedestrians, and vistas. Reduction reduces the size of a tree, often for clearance for utility lines.Reducingthe height or spread of a tree is best accomplished by pruning back the leaders and branch terminals.