To earn an ISA Certified Arborist® credential, you must be trained and knowledgeable in all aspects of tree biology, tree identification and selection, tree-soil-water relations, tree nutrition and fertilization, tree planting and establishment, pruning concepts and techniques, cabling, bracing and lightning protection, problem diagnosis and management, tree preservation on construction sites, climbing and safe work practices, and tree risk assessment.

 ISA Certified Arborist® have met all requirements to be eligible for the exam, which includes three or more years of full-time, eligible, practical work experience. Certification is valid for three years, during which time the arborist must complete 30 continuing education units (CEUs) to re certify. To qualify as a candidate to write the exam, an individual must have a minimum of three years’ verifiable experience in various aspects of tree care.