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Urban Forestry

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Trees to Know in Oregon and Washington

NEW! 70th Anniversary Edition! For 70 years, people have turned to one book to learn about Northwest trees. This edition expands its scope, covering even more species of trees — including several rare species native to ...

Jan 2021 | OSU Extension Catalog Peer reviewed (Orange level)

Garden Ecology Lab shares research-based information for home and community gardens

Launched in 2017, it’s the first lab in the United States wholly focused on socio-ecological research in home and community gardens.

Gail Langellotto | Oct 2020 | Impact story

Pruning Timber & Landscape Trees for Quality Health

Learn how corrective pruning of young timber stands and landscape trees can help nip problems in the bud. Learn proper pruning techniques that help promote desired structure and growth and how this will positively impact your ...

Jul 2020 | Video

Solve Pest and Weed Problems: A New Resource for Master Gardeners and the Public

This webinar is part of the 2020 series of Advanced Training Webinars for Master Gardeners sponsored by Oregon State University Extension.

Weston Miller, Brooke Edmunds | Jul 2020 | Video

Tree School Clackamas teaches love for the land

Educational event draws hundreds from woodland community in Clackamas County and beyond.

Glenn Ahrens, Rose Clarke, Michael Bondi, Kimberly Jacobsen Nelson | Apr 2019 | Article

Can you identify this black and white bug?

Q: I have lived in Oregon all my life and never seen this kind of bug before, what is it? It's not very fast moving, this one wasn't anyway.

A: View answer | View all featured questions

How can I get my clothes unsapped?

Q: How do I get pine sap off of clothing?

A: View answer | View all featured questions

International Society of Arboriculture (ISA) - Pacific Northwest Chapter

The Pacific Northwest Chapter of the International Society of Arboriculture (PNW-ISA) is a member organization for arborists and urban foresters. We bring together professionals from Alaska, Idaho, Oregon, Washington, and British Columbia. Since 1979, we have been a resource and advocate for the green industry.

May 2018 | Online resource

What is up with this tree?

Q: We had a viewer send in this photo of a tree in Cedar Canyon near Banks, Oregon. We posted this to the OPB/ Oregon Field Guide Facebook page and now I feel a responsibility to give folks an accurate ID of what is causing this strange formation atop the tree. Mistletoe? Witch's Broom? Something else?

A: View answer | View all featured questions

Are there insect issues with birch trees?

Q: Is it true that white paper birch in the Willamette Valley have been infested with insect like beetle? I wanted to plant one this spring and my yard maintenance service told me I should consider a different type due to the insect problem.

A: View answer | View all featured questions