PNW-ISA Pruning, Planting and Selecting for Street Tree Diversity - CANCELLED
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November 4 @ 9:30 am - 3:30 pm Instructor: Jim Barborinas and Christina Pfeiffer CEUs: 5.0 AM / 1.0 B-S, 4.0 B-P

 Export to Your Calendar 11/4/2020
When: 9:30 AM
Where: Urban Forest Nursery
15119 McLean Rd
Mt Vernon, Washington  98273
United States
Contact: 503-874-8263

Online registration is closed.
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The importance of maintaining urban tree canopy is becoming ever more compelling. Campaigns to plant millions of trees are sprouting up throughout the region. The stakes are high to ensure that newly planted trees have the right start for future sustainability and function.

Errors in plant selection and planting practices, and a lack of early structural training can thwart future tree vitality and longevity. This workshop will provide essential currant information on practices that can make all the difference between a well-functioning future urban canopy and one with greater demands for maintenance and replacement planting.

Through classroom discussion, demonstrations, and a walk through the Urban Forest Nursery fields, we will cover tree nursery practices, species selection, root ball preparation, planting practices, and early structural pruning. The nursery walk will include a look at the progression of pruning and structural training for street tree specimens over a 3 to 5-year span.

Learn the following:

  1. Lessons from the nursery: How trees are selected, planted, pruned, staked and harvested for landscape use.
  2. Expanding your tree planting palette: Get acquainted with different species and new tree cultivars that can become new favorite choices. Consider outstanding alternatives for overused ash and maple varieties. How to select trees for optimal suitability to urban planting sites and to build diversity into tree populations.
  3. Understand the differences and pros / cons of different types of tree stock. Balled & Burlap, bare root, containers, grow bags.
  4. Structural pruning of small trees: Learn how to prune trees and what to look for in their early years to maintain structure and balance into the future. How to use structural pruning as preventive maintenance.
  5. How to assess and employ proper root ball preparation at planting. Learn how to deal with root issues during planting to help ensure tree success.



Location: Urban Forest Nursery, 15119 McLean Rd, Mt. Vernon, WA 98723

  • 9:00 – 9:30, Registration & Sign-In  
  • 9:30 – 9:40, Making Sense of Plant Names: Hybrids, cultivars, trade names.
  • 9:45 – 10:25, Expanding your tree planting palette. Learn about new tree cultivars to consider for outstanding alternatives to ash and overused maple varieties. How to incorporate diversity into street tree plantings based on urban friendly forms and mature sizes, less aggressive roots, minimal pest challenges, great fall color, visual interest, and other qualities.
  • 10:25 – 10:45, Understanding Tree Production Methods. Pros and Cons of different root ball types.
  • 10:45 – 11:00, Break
  • 11:00 – 11:30, The Power of Structural Pruning. Early post-planting training methods.
  • 11:30 – 12:00, Box lunch
  • 12:00 – 1:30, Tree Production Tour. Review of the process of growing and training street tree stock from seedlings and liners to saleable size. Planting, pruning, staking, tying, irrigation, and pest management practices used to produce quality trees. Structural training sequence during nursery cultivation.
  • 1:30 – 2:00, Planting BMPs – Demo Table. Root ball preparation practices for different types of stock as preventive maintenance. Review of current research on best practices and the most common problematic errors. How to correct common root ball conditions at planting.
  • 2:00 – 2:15, Break
  • 2:15 – 3:15, Farm tour to review structural issues and pruning options on established trees.
  • 3:15 – 3:30, Final questions, wrap up, CEU's.



Jim Barborinas is the President and Founder of Urban Forestry Services, Inc., (now a Division of Bartlett Tree Experts), has worked throughout the Puget Sound Region with large and small communities, landscape architects, engineers, developers, and private citizens on many urban forest issues for over 30 years. He has provided tree evaluations, tree protection specifications, design review, and monitoring for contract compliance for mature landscape trees on numerous sites, including most Seattle and King County Housing projects over the last 15 years. He has helped to develop Urban Forest Strategy Plans for communities of Tacoma, Sumner, Mount Vernon, Puyallup, and Marysville and is the on-call Arborist for several other communities including Burlington, Burien, La Conner, Mount Vernon, Marysville, North Bend, Duvall, Mukilteo and Snoqualmie.

Jim, and his wife, Annie, also operate Urban Forest Nursery, Inc., a 32 acre wholesale tree nursery in the Skagit Valley, specializing in growing high quality street and landscape trees specifically selected and grown for characteristics that complement the limited planting spaces and adverse conditions typical of urban planting sites today. From his knowledge of growing trees, he is particularly adamant about soil preparation and proper tree selection regarding location, installation and maintenance. Jim has a BS and MS in Forestry and Resource Management.

Christina Pfeiffer is a horticulture educator, writer and consultant with 40-years’ experience in landscape management and arboriculture. During earlier years of her career, she led landscape management and tree care efforts at the Holden Arboretum and Washington Park Arboretum.  She is currently a part-time consultant with Urban Forestry Services | Bartlett Consulting and author of Pacific Northwest Month-by-Month Gardening from Cool Springs Press. She teaches pruning and arboriculture at Edmonds Community College, and is a regular speaker for a variety of public and professional seminar programs, including the PNW-ISA, UW Botanic Gardens, PlantAmnesty, WSU Master Gardeners and Urban IPM, and the NW Flower & Garden Festival.  Christina has degrees in horticulture from Michigan State and the University of Washington. She has been an ISA Certified Arborist® since 1990 and is Tree Risk Assessment Qualified.


Refund Policy

  • Cancellations made at least 10 days prior to the event will be refunded minus the PayPal processing fee (2.9% + .30 cents)
  • Cancellations made within 5-9 days of the event will be refunded at 75%.
  • Refunds will not be made available for no-shows.


Late Registration

  • Participants are expected to enroll prior to the registration deadline.
  • Participants can register at the door of the event only if space is available. Individuals will need to pack their own lunch.
  • Late registration is possible on a space available basis. You can contact our office at (800) 335-4391. There may, or may not be, room available for those who show up without registering ahead of time for the workshop. We encourage you to register for the workshop in advance.