Arborists use several techniques on a tree’s crown (branches and leaves) to get different results, including: Thinning: cutting a selection of branches on young trees to stimulate better growth and health  Raising: removing the lower branches of the tree, giving it a more elongated shape Reducing: removing the large, top branches for a more stocky, round appearance Cleaning: removes dead, dying, and diseased branches for better tree health and overall aesthetics