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What is an arborist?

An arborist is a tree-care professional who specializes in caring for, maintaining and, when needed, removing individual trees around homes and other buildings.

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What does an arborist do?

Arborist work centers on individual trees: deciding what pruning a tree needs, planting, emergency care after storms and preventive plant health care. “An arborist can determine what type of pruning is necessary.” Source: International Society of Arboriculture (TreesAreGood.org), read 2026-10-29. “A few other services arborists can provide include emergency tree care, planting, and preventative plant health.” Source: Minnesota Department of Natural Resources, read 2026-10-29. “Some arborists plant trees, and most recommend species that are appropriate for certain locations.” Source: International Society of Arboriculture (TreesAreGood.org), read 2026-10-29.

How do state sources define an arborist?

State sources describe an arborist as a trained tree-care professional who looks after individual trees, and Virginia's tree-trimming regulation defines the word in a single line. The Minnesota Department of Natural Resources says: “An arborist is a trained professional who cares for and specializes in maintaining trees.” Source: Minnesota Department of Natural Resources, read 2026-10-29. In Virginia, “"Arborist" means an individual engaged in the profession of arboriculture.” Source: Virginia Safety and Health Codes Board (Virginia Administrative Code), read 2026-10-29.

Does an arborist cut down trees?

Yes, removal is part of the work: the Maine Forest Service includes removing individual trees in its description of an arborist, and the International Society of Arboriculture (ISA) lists when removal is worth considering. In Maine, “An arborist is a professional who specializes in caring for and/or removing individual trees around homes and other buildings.” Source: Maine Forest Service, read 2026-10-29. “Consider hiring an arborist when your tree is dead or dying, an unacceptable risk, causing an obstruction, crowding other trees, or located in an area where there’s new construction.” Source: International Society of Arboriculture (TreesAreGood.org), read 2026-10-29.

What is an arborist certification?

An arborist certification is an optional credential from a non-governmental body such as the International Society of Arboriculture, and the holder has to renew it to keep it. “An ISA arborist certification is a nongovernmental, voluntary process by which individuals can document their base of knowledge.” Source: International Society of Arboriculture (TreesAreGood.org), read 2026-10-29. “It grants the use of a credential to individuals for a specific period of time.” Source: International Society of Arboriculture, read 2026-10-29. “To retain the credential, certificants must meet requirements for renewal.” Source: International Society of Arboriculture, read 2026-10-29.

What is a qualified arborist?

In Virginia's tree-trimming regulation, a qualified arborist is a defined term built on related training, on-the-job experience and demonstrated ability with the techniques involved. In Virginia, “"Qualified arborist" means an individual who, through related training and on-the-job experience, is familiar with the equipment and hazards involved in arboricultural operations and who has demonstrated ability in the performance of the special techniques involved.” Source: Virginia Safety and Health Codes Board (Virginia Administrative Code), read 2026-10-29. “"Qualified arborist trainee" means an individual undergoing on-the-job training under the direct supervision of a qualified arborist.” Source: Virginia Safety and Health Codes Board (Virginia Administrative Code), read 2026-10-29.

What is a consulting arborist?

Portland, Oregon's tree code names consulting arborists registered with the American Society of Consulting Arborists (ASCA), alongside ISA arborists, in its definition of who may write an arborist report. In Portland, Oregon, the tree code defines an arborist as “A professional listed as a certified arborist by the International Society of Arboriculture [ISA] or a consulting arborist registered with the American Society of Consulting Arborists [ASCA].” Source: City of Portland, Oregon (Portland Permitting & Development), read 2026-10-29.

What is an arborist report?

An arborist report is a written report by an arborist about specific trees; Portland, Oregon asks for one on some building and land-division projects, listing the arborist's ISA or ASCA number, the date of the most recent assessment, and each tree's species, size (DBH) and condition. The City of Portland says: “Find out when you need an arborist report when you're building or renovating.” Source: City of Portland, Oregon (Portland Permitting & Development), read 2026-10-29. “Get information about tree reports from arborists before development begins.” Source: City of Portland, Oregon (Portland Permitting & Development), read 2026-10-29.

What is DBH in an arborist report?

DBH is how a tree's trunk size is written down: Portland's arborist report guide asks for each tree's size as DBH, and Virginia's tree-trimming regulation defines it as a diameter taken 4.5 feet above the ground. In Virginia, “"DBH" means acronym for diameter at breast height; diameter of a tree measured at 4.5 feet (1.3 m) above ground.” Source: Virginia Safety and Health Codes Board (Virginia Administrative Code), read 2026-10-29.

What is arboriculture?

Arboriculture is the field an arborist works in, and Virginia's regulation defines it as the art, science, technology and business of tree care. In Virginia, “"Arboriculture" means the art, science, technology, and business of utility, commercial, and municipal tree care.” Source: Virginia Safety and Health Codes Board (Virginia Administrative Code), read 2026-10-29.

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