Loading Events

« Back to Class Schedule

Register Now

Pruning, Planting and Selecting for Street Tree Diversity

May 24 @ 9:30 am - 3:30 pm
Instructor: Jim Barborinas and Christina Pfeiffer CEUs: 5.5 Pending Registration Fees: $90.00 - $180.00

Workshop Description

The role of an Arborist often involves knowing and using expertise in the areas of pruning, planting and tree selection.  This workshop will start with nursery practices, learning about new tree cultivars and choices for various environments, in particular street planting.

Many of the challenges we face with older trees, and many of the structural failures seen on trees of all ages, may be prevented by proper training and pruning when they are young. This preventive care and maintenance will help trees in the urban forest remain healthier, more productive, and safer for the people who live around them. Further, investment in structural training of young trees means far less costly measures will be necessary to maintain a tree properly as the tree becomes mature. The reduction of risk and liability associated with poorly structured trees is, in itself, an excellent reason to begin and maintain a structural pruning program for young trees in an urban area.

We will review proper pruning practices and the components of strong tree structure, how to remove or reduce potential risk factors through pruning, and developing a multi-year pruning program for young trees.  On a walk through Urban Forest Nursery, the progression of pruning and structural training on different species of trees over a 3-year span will be discussed.

Workshop Topics

  1. Lessons from the nursery: How trees are selected, planted, pruned, staked and harvested for landscape use
  2. Expanding your tree planting palette: See up close and personal many of the new tree cultivars that will become new favorite choices for street tree use.   Consider outstanding alternates for the overused ash and maple varieties, trees with great form, characteristics, limited mature size, less aggressive roots, great fall color and minimal insect and disease challenges.
  3. Structural pruning of small trees: Learn how to prune trees in their early years after transplant to maintain structure and balance into the future.
  4. Planting container grown nursery stock: Learn how to deal with root issues during planting to help ensure tree success.


Jim Barborinas is the President and Founder of Urban Forestry Services, Inc., 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 20 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, Coupeville, La Conner, Mount Vernon, Newcastle, North Bend, and Snoqualmie.

Jim, and his wife, Annie, also own and 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 has over 30 years experience in landscape management and arboriculture.  Sustainable and efficient landscape techniques are a special area of interest and expertise.  In addition to her private practice, she is a consulting associate with Urban Forestry Services, Inc.  Her teaching experience includes past presentations for the PNW-ISA, seminars for professionals and the general public.  Christina has also taught courses in pruning and arboriculture at Edmonds Community College, South Seattle College, and the University of Washington.  She holds degrees in horticulture from Michigan State and the University of Washington and is an ISA Certified Arborist and Tree Risk Assessment Qualified.

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


Urban Forest Nursery
15119 McLean Rd
Mt Vernon, WA 98273 United States