American Society of Arboriculture

The American Society of Arboriculture (ASA) is a professional organization dedicated to promoting the health, safety, and sustainability of trees. It provides education, certification, and resources for arborists—experts who care for and manage trees. ASA encourages best practices in tree planting, pruning, and maintenance to ensure trees thrive and remain safe for communities. The society also supports research and advances in arboriculture to improve urban and natural environments, fostering a deeper understanding of tree science among professionals and the public.