Healthy trees are the cornerstone of a healthy yard and garden. To keep your trees strong and beautiful, you must perform a variety of services which include pruning away dead and dying branches, protecting them against pervasive pests such as Emerald Ash Borers, and stimulating healthy root growth. You may be able to complete some of these tasks on your own but trickier jobs, particularly those involving large trees, may require the work of a professional arborist.