A thorough tree health assessment evaluates crown condition, trunk structural integrity, root zone health, pest and disease indicators, and environmental stress factors. ISA-standard assessments follow a systematic top-down approach: crown density and dieback percentage, branch attachment strength, trunk cavities and decay indicators, root plate stability, and soil conditions. Each species has unique health indicators that trained arborists recognize.
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Tree health assessment should be performed by an ISA Certified Arborist. Hazardous trees can fail without warning. If you suspect a tree is hazardous, keep people and vehicles away from the potential fall zone and contact a professional immediately.
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Key signs of an unhealthy tree include: crown dieback exceeding 25%, premature leaf drop or discoloration, fungal fruiting bodies (mushrooms) at the base or on the trunk, bark cracks or peeling, leaning that has increased over time, root heaving or soil cracking around the base, dead branches, and pest boring holes. Any single sign warrants professional evaluation.
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