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Basic Tree Identification

May 15 @ 8:30 am - 2:30 pm
Instructor: J. Casey Clapp CEUs: 5 for A, U, TW, M, L

Proper tree management starts with knowing the tree you’re managing. When trying to recommend an appropriate treatment, diagnosing issues, or understanding how a tree will respond to changes in condition, identifying the tree you’re dealing with is the first step.

This basic identification workshop will cover topics to help the practitioner identify common species in the Puget Sound Region, both native and non-native. We will review common terminology and concepts that will help arborists and other green industry workers narrow down trees not covered in the workshop into genera, and ultimately lay the basis for identification down to the species.

As there are many more species that can grow in our region than can be covered in a single basic workshop, focus will be on larger concepts that will lay the ground work for future identification. We will cover the use of dichotomous keys and get familiar with descriptive terminology to help narrow down unknown species.

The workshop will be inside for the first half and will go outside for the second half to get familiar with using the concepts and terminology in the real world. We’ll be in the University of Washington Arboretum, so we will have no shortage of species to find! The workshop will be hands on, and questions and interaction is encouraged.

J. Casey Clapp is an Associate Consulting Arborist with Tree Solutions, Inc., and manages the Portland, Oregon office.  He specializes in tree identification, urban forest and individual tree management, tree diagnostics, risk assessments, and tree cones.  He holds a Master of Science degree in Environmental Conservation with a focus in Forest Resources and Arboriculture (University of Massachusetts, Amherst) and a Bachelor of Science degree in Forest Management with a focus on Urban Forestry (Oregon State University).  He’s been involved in urban forestry and arboriculture since 2010. Casey has been studying tree biology and dendrology since 2007, and has presented at conferences across the nation and internationally.

Refund Policy

  • Cancellations made at least 10 days prior to the event will be refunded at 100%.
  • Cancellations made within 5-9 days of the event will be refunded at 75%.
  • Cancellations made within 1-4 days of the event will be refunded at 50%.
  • Refunds will not be made available for no-shows.

If you cannot attend a class for which you are registered, please contact the PNW-ISA office as soon as possible.

ISA CEUs: 5 for A, U, TW, M, L

Allied Professionals are members of allied organizations. See our list of qualifying organizations.


UW Arboretum
2300 Arboretum Drive E
Seattle, WA 98112 United States