In 2024, the International Society of Arboriculture (ISA) announced its renewed commitment to the Council of Tree and Landscape Appraisers (CTLA) and its intention to collaborate on the development of an eleventh edition of the Guide for Plant Appraisal. 

As the initial step in this process, ISA seated three representatives to the CTLA Content Review Committee. The Content Review Committee is a consensus committee of subject matter experts with respect to the amenity tree and plant appraisal process. This committee plays an important role in providing guidance during the formal review process for the development of the Guide for Plant Appraisal editions. 

Additionally, ISA has established the ISA Guide for Plant Appraisal Task Group, which supports ISA’s Content Review Committee representatives by providing review feedback and expert input during the CTLA’s revision process. 

ISA currently has a vacancy of one open seat to fill on the Content Review Committee and is accepting applications from ISA members for this role. More information on this role and the form for applications can be found here.

The deadline for applications is Wednesday, 3 December 2025. 

Inquiries regarding the Guide for Plant Appraisal or the Council of Tree and Landscape Appraisers can be directed to [email protected].