Some arborists plant trees and most can recommend types of trees that are appropriate for a specific location. The wrong tree in the wrong location could lead to future problems as a result of limited growing space, insects, diseases, or poor growth.

An arborist by definition is an individual who is trained in the art and science of planting, caring for, and maintaining individual trees. ISA arborist certification is a nongovernmental, voluntary process by which individuals can document their base of knowledge.