Many factors, such as insects, disease, and weeds, can contribute to thin or bare patches in an otherwise healthy lawn. Once you or American Tree Maintenance have determined the cause and treated the problem, you want to make sure your fill-in strategy will be successful. Here are the recommendations of American Tree Maintenance. Seed Selection To fill in an existing lawn, choose grass seed that is the same type as the grass already growing. Grasses that do best in the So