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Fundamentals and Theory of Pruning Trees and Shrubs

May 18 @ 8:30 am - 3:30 pm
Instructor: Tyler Roth CEUs: 6

This pruning workshop will cover all the best management practices pruning techniques required by arborists. The course will cover both the theory and practice of pruning evergreen and deciduous trees, shrubs and fruit trees. This is an ideal workshop for practitioners and consultants alike.

Pruning trees and shrubs can be a very extensive topic with many areas of focus. This course and presentation are designed to discuss some fairly advanced topics that are intended to explain the theory of why we should be pruning the way we do. At times the presentation may seem to move from technically advanced to more basic topics. It was designed this way so that we can understand some complexities of forces that trees undergo before discussing how to mitigate them through pruning. The question “why” has always proved to be a bedrock foundation for understanding.

Workshop attendees will learn:

  • Reasons for pruning trees
  • Tree structure and dynamic forces
  • Tree defects and  restorative pruning
  • Tools and PPE
  • Work order specifications
  • Fruit Tree pruning

Workshop Agenda

  • 8:30 - 10:00, Morning Session
    What is pruning?
    Who’s in charge?
    Tree Forms: Excurrent & Decurrent Trees
    Forces on Trees: How Trees Diffuse Forces
    Mass Dampening: Interactive Activities
  • 10:00-10:15 Break
  • 10.15am to 12pm, Mid -Morning
    What is Lion Tailing?
    Physics: Lever Arm & Bending Moment
    Wind Forces on Trees: Respect your Forces
    The 4 Main Forces on Trees -Wood Properties
  • 12:00-12:45 Lunch
  • Afternoon session
    Common Tree Defects
    Included Bark
    Young Tree Structural Pruning
    Brief Cutting Techniques
    Outdoor Pruning Activities
  • 3.30pm - Workshop ends.

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.


Tyler Roth

Tyler Roth is a certified arborist (PN-7469A) who lives in Hood River, Oregon. He is the owner of Gorge Tree Surgeon, a tree service in the central Columbia River Gorge.
Tyler Roth is TRAQ qualified, a graduate of Community Tree Management Institute (CTMI 2016), a Hood River Tree Committee member, and a climbing and consulting arborist. Tyler has an AAS in Natural Resources: Forestry from MHCC and a BAS in Horticulture from Oregon State University.

This workshop is hosted in partnership with Oregon State University.

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


Oregon State University
Kelley Engineering Center
Corvallis, OR 97331 United States