Public Review of the Guide for Plant Appraisal, 10th Edition

In preparation for development of the eleventh edition of the Guide for Plant Appraisal, a public review and comment period on the current, tenth edition, of the Guide is open until January 31, 2025.

We encourage anyone with comments on the Guide to submit them via this webform. All comments should specify the section in question, indicate the comment, provide a proposed revision for the section, and include a rationale for the change.

Following this yearlong public comment period, the Council of Tree and Landscape Appraisers (CTLA) will be responsible for development of the eleventh edition of the Guide for Plant Appraisal. The CTLA’s Content Review Committee will assess all public comments in the spring of 2025 and outline a direction for the revision.

The CTLA is a collaboration of organizations that share an interest in developing industry consensus methodologies for tree and landscape plant valuation, as published in the Guide for Plant Appraisal editions.

The seven organizations that make up the CTLA—AmericanHort, the American Society of Consulting Arborists, the American Society of Landscape Architects, the National Association of Landscape Professionals, the Association of Consulting Foresters of America, the International Society of Arboriculture, and the Tree Care Industry Association—reaffirmed their working contract in November 2023 to carry their collaboration forward with a new edition of the Guide. ISA will continue to serve as the publisher of the Guide.

The current edition of the Guide for Plant Appraisal is available for purchase in digital and print format through ISA’s online web store. Inquiries regarding the Guide for Plant Appraisal or the Council of Tree and Landscape Appraisers can be directed to eps@isa-arbor.com.

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