Hot Off the Press!

PNW-ISA member Christina Pfeiffer of Seattle, WA has recently published an updated edition of her book, Pacific Northwest Month-by-Month Gardening: What to Do Each Month to Have a Beautiful Garden All Year.

Notes Christina: “This practical guide has been updated with current information for maintaining beautiful and healthy gardens, tuned into important regional issues such as water conservation, and protecting pollinators. Arranged by month, each chapter cues into the seasonal rhythms and life cycles in the garden and the timely tasks that go along them. When we can work in sync with nature, caring for the garden becomes more of a pleasing journey, and less of a battle. And as with the first edition, this book offered me an opportunity to include accurate and up-to-date information on tree care and hiring Certified Arborists that is so often missing in general garden guides for the public.”

In Memoriam: Cass Turnbull and Mike Bowman

Cass Turnbull

February 7, 1951 – January 26, 2017

In late January, we were all saddened to learn of the sudden and unexpected death of well-known PlantAmnesty founder Cass Turnbull. While vacationing in Hawaii with her husband, she suffered a fatal heart attack after a swim. Cass was the power, the energy, the humor, and the magic behind PlantAmnesty, a long-time member of ISA and the PNW Chapter, and she will be missed by all who knew her.

PlantAmnesty is organizing a public celebration of her life called “The Life and Times of Cass Turnbull” at 1 PM on Saturday, March 25, 2017 at Shoreline Community College Theater in Shoreline, WA. Further information can be found at

Read More "In Memoriam: Cass Turnbull and Mike Bowman"

Grove of the States Arborist Work Day

group photo of On November 11, 2016, a team of two dozen highly skilled volunteer arborists from four local companies sponsored a work day in Oregon’s Grove of the States to prepare the site for the next phase of its restoration.

Located at the southbound I-5 French Prairie Rest Area (at Milepost 281 near Wilsonville), the Grove is believed to be the oldest public arboretum of state trees in the US and was originally a collection of trees from 53 US states and territories. When the Grove was planted in 1967, planners did not provide enough space for the new trees to grow into their mature height. Over the years, some of the larger species and encroaching Douglas fir trees out-competed their neighbors for sunlight and many of the trees became diseased, unhealthy, or died.

Preparing for the Grove’s 50th anniversary in August 2017, the Oregon Travel Information Council (DBA Oregon Travel Experience) and its partners at the Oregon Department of Forestry, Friends of Trees, and other tree lovers have joined efforts to save the Grove for future generations. Read More "Grove of the States Arborist Work Day"

Member Survey 2016 Summary Report

Last summer, PNW-ISA sent an electronic survey to the membership to solicit feedback on our overall member services and benefits. Congratulations to Charles Rognlie, the lucky winner of a $100 course discount for participating in the survey.

The PNW-ISA Board of Directors and staff have reviewed the survey and summary of responses. The candid responses – both positive and negative – are extremely useful to us as we move forward with a new strategic plan. Together, we continue to build a solid, effective member organization for the professional arboriculture community in the Pacific Northwest.

We would like to see more members take advantage of the Certified Arborist Directory. Did you know that the basic listing is free? Signing up is as simple as checking a box. Follow the directions on the Arborist Directory Registration page. This complimentary member service is one of the ways we can help ensure homeowners and others find qualified tree care companies and consultants.

What follows is the summary of responses we received.

Read More "Member Survey 2016 Summary Report"

“Identifying Diseases” Course a Hit

welcome mushroomThe first course to be held in BC on Identifying Diseases was held at Sunnyside Acres Urban Forest in Surrey on November 17th and 18th. Delivered by Julian Dunster and Jeff Fournier, both courses sold out.

Thanks to Nadia Chan and her staff at the City of Surrey, and to Jeff for collecting and preparing an amazing array of fungi and wood samples, and for laying out the dissections in the forest.

It was a fun course to work on and we look forward to hosting more of them here in the coming years. Read More "“Identifying Diseases” Course a Hit"

ATC 2017 and 2018 Announcements

2017 Conference Theme To Be Determined!

The conference planning committee for the 38th Annual Training Conference is off and running. The group has met several times already to iron out volunteer roles and brainstorm about the conference theme and potential speakers.

The conference will be held at the Lynnwood Convention Center in Lynnwood, WA. Attendees can expect a Tree Academy (or Academies), Field Day, and indoor sessions for every discipline.

Mark your calendars for September 24-27, 2017. We expect to hold the Chapter Tree Climbing Championship during the conference as well.

And Looking Ahead to 2018 ...

The PNW-ISA is excited to announce that the 2018 Annual Training Conference will be held in Vancouver, BC in conjunction with the Canadian Urban Forest Conference (CUFC) and Urban Tree Diversity 3 (UTD3).

CUFC brings together leading experts from across the country, allowing for dialogue between professionals, community groups, and practitioners on innovative strategies, policies, technologies, research, and best management practices related to arboriculture and urban forestry.

UTD3 is an international conference that addresses research on urban tree diversity and its crucial implications for urban foresters and society in achieving resilient, vibrant, and productive urban forests.

The PNW-ISA will be working with CUFC and UTD3 to offer a unique conference, bringing together international, national, and regional speakers related to arboriculture and urban forestry.

Any questions related to ATC 2018 can be sent to Nadia Chan.

PNW-ISA Member Speaking at Northwest Green Industry Conference

jamesbarborinasJim Barborinas of Urban Forestry Services, Inc. will present Get Out of Your Rut: Try These New, Exciting and Underutilized Tree Varieties at the Northwest Green Industry Conference.

Jim will share information on the many tree varieties available for street and landscape use including trees with better disease and insect resistance, well defined mature forms, and just more diversity in the landscape. See what's available in improved tree cultivars to replace the overused maple, oak, and ash trees planted almost everywhere. Come and learn what is available and spread the word to cities, landscape architects, designers, and developers.

Jim is a regular contributor to the PNW Trees Newsletter. Read his previous PNW Tree Profiles here. The Northwest Green Industry Conference will take place at Semiahmoo Resort in Blaine, WA on January 26 & 27. Visit for more information and to register.

Results from the Portland Regional Tree Climbing Competition

The Portland Regional Tree Climbing Competition was held June 11-12, 2016 in Mary S. Young Park in West Linn, OR. Read More "Results from the Portland Regional Tree Climbing Competition"

PNW-ISA’s Antitrust Policy: What Members Should Know

The PNW-ISA Board of Directors unanimously approved an Antitrust Policy for the Chapter based on feedback and a template from ISA. Nonprofit organizations, like PNW-ISA, can be impacted by antitrust violations, and proven violations can cost millions of dollars. Read More "PNW-ISA’s Antitrust Policy: What Members Should Know"

Mountain Ash Sawfly Persists in the Pacific Northwest

This article is offered as a follow-up to last year’s article on Mountain Ash Sawfly, a new pest in the Pacific Northwest that had previously only been a problem to ornamental Mountain Ash specimens east of Michigan.

The emerging population is persisting and appears to have increased range in 2016. The larval stage of this defoliator consume all the leaves of the lower branches (about halfway up from the base) by an army of small yellow caterpillars, moving in groups on each compound leaf, leaving only the leaf stem and ribs intact. There is no apparent impact on fruit set or quantity. Read More "Mountain Ash Sawfly Persists in the Pacific Northwest"