An arborist, tree surgeon, or (less commonly) arborist is a professional engaged in the practice of arboriculture, which involves the cultivation, management, and study of individual trees, shrubs, vines and other perennial woody plants in dendrology and horticulture. Arborists are considered tree doctors who specialize in caring for trees. This could include acting as a consultant to determine the type of trees to be used in designing a landscape, pruning them for optimal health and growth, or diagnosing and treating trees with diseases. Arborists also provide assistance with structural problems that arise with trees by working directly with customers or consulting with landscape companies.
Arborists can help people learn and understand what nutrients help trees grow, what diseases infest trees, and how the immune system of trees works. A person who grows trees is called an arborist or forester.