Trimming bushes is a common gardening task that involves cutting back overgrown branches and foliage to maintain the desired shape and size of the bush. Pruning, or trimming, is done to promote healthy growth and to remove dead or diseased branches. Pruning also helps to improve air circulation and light penetration, which can help to reduce the risk of disease. Trimming bushes can also be done to create a more aesthetically pleasing look.