What Is a Certified Arborist?
The ISA Certified Arborist (International Society of Arboriculture) credential is the primary professional certification in tree care. To earn it, a person must have a combination of formal education in arboriculture and/or years of professional experience, pass a comprehensive exam covering tree biology, diagnosis, pruning, soil management, and safety, and maintain the credential through continuing education.
Certified Arborists are professionals with demonstrated knowledge of tree care beyond basic cutting and removal skills.
What's a "Tree Trimmer" or "Tree Service"?
In most states — including Florida — there is no license required to operate as a tree service company. Anyone can buy a chainsaw and start cutting trees. Some tree companies are operated by skilled professionals with years of experience and good practices. Others are not.
The range of knowledge and competence in the tree service industry is wide.
When a Certified Arborist Matters Most
Health and disease diagnosis: If a tree is declining and you want to understand why — is it root rot, nutrient deficiency, pest damage, a structural issue? — a certified arborist has the training to diagnose it accurately.
Risk assessment: Formal tree risk assessment — evaluating whether a tree is likely to fail and how serious the consequences would be — is a professional arboriculture skill. If you're trying to decide whether a large tree over your house is safe, you want someone with real assessment training.
Complex structural decisions: Whether to cable, reduce the crown, remove one co-dominant stem, or remove the tree — these decisions benefit from arboricultural expertise.
Permitted work: Some municipalities and homeowners associations require documentation from a certified arborist for certain tree work (live oak removals, work near heritage trees).
When Experience Matters as Much as Credentials
For straightforward work — routine pruning, standard removal, stump grinding — a skilled, experienced tree company without a certified arborist on staff can do the work well. Credentials don't automatically mean quality execution in the field.
The best combination is a company where at least one person holds the ISA credential AND has real-world climbing and equipment experience. Paper knowledge without field skill, or field skill without tree biology knowledge, both have limitations.
What to Ask
When hiring a tree service, it's reasonable to ask:
- "Do you have a certified arborist on staff or available for consultation?"
- "Can you explain why you're recommending that approach for this tree?"
- "Are you insured?" (non-negotiable for any legitimate tree work)
Good companies can answer these questions clearly.
Questions about your trees? Call (850) 570-4074 or request a consultation online.