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Tilia Trees in Portland, Aphids, and Pesticide Advisory

Tilia is an important tree in Portland’s urban forest. They are adaptable trees that can thrive in a variety of conditions. However, many varieties are susceptible to aphids. There is an Oregon Pesticides Advisory about the use of noenicitinoid insecticides on Tilia trees.

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Bronze Birch Borer

Find information about the bronze birch borer insect pest.

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Tree Inventory Project Is Back in 2023

The Urban Forestry Inventory Project is back in 2023. This year the goal is to inventory 100,000 trees in 41 neighborhoods across Portland.

News article


Western Redcedar Dieback

Researchers in Oregon and Washington are sounding the alarm about Western redcedar decline. There is some hope for the future of Western redcedar in western Oregon. Trees growing in wet areas, northern-facing slopes, and other places with plenty of water show less damage from heat and drought.

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Meet Some of Our Favorite Heritage Trees

Nomination for new Heritage Trees closes May 1, 2023. Read about some of the already recognized trees. Get inspired to nominate a special tree in your neighborhood.

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2023 Oregon Heritage Tree Hero Award Recipient, Gregg Everhart

Celebrate this year's Oregon Heritage Tree Hero Award Recipient, Gregg Everhart, and a newly designated Heritage Tree at the Knott Park Tree Walk.

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Care for Young Trees this Summer

Get some tips and tricks on how to best care for young trees during the hot days of summer.

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Celebrating the Legacy of Bill Naito for AAPI Heritage Month

Learn about Bill Naito's role in shaping the city we know and love today.

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Event Highlight: Tree Walk in Columbia Park

Learn some fun facts we shared at our Columbia Park tree walk event.

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Check out this Year's Learning Landscapes Highlights

Learn about the Learning Landscapes Program, including this year's plantings and how to get involved.

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Celebrate Asian American and Pacific Islander Heritage Month

Celebrate Asian American and Pacific Islander (AAPI) Heritage Month with selected articles about AAPI communities and connecting with the natural world.

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Meet Urban Forestry's New Community Stewardship Coordinator

Meet our new Coordinator.

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Celebrate Women's History Month & Meet Three of the Fabulous Women of Urban Forestry

This women’s history month we are celebrating the incredible women of Urban Forestry. We wanted to take a moment to introduce some of our superstars and ask them a few questions about their work.

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City Bureaus & Urban Forestry Join Forces to Plant More Street Trees

Urban Forestry is partnering with other Bureaus to pilot a project to plant more street trees in the curb/parking zone. These new curb designs (shown in the photo above) slow traffic to improve road safety and provide space for trees.

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Portland Urban Forestry Marks 45 Years as Tree City USA

The Arbor Day Foundation has awarded Portland its 45th Tree City USA Award, 25th Growth Award, and 3rd Tree Cities of the World Award. These programs recognize high achievement in municipal tree programs nationally and globally.

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Join PP&R at a family-friendly tree planting kickoff event and Arbor Day celebration

Arts and crafts, hundreds of tree plantings in SE Portland’s Lents Park and neighborhood

Press release


Prevent Dutch Elm Disease

To protect our elm trees from Dutch elm disease, pruning of any elm is prohibited from April 15 to October 15 in the City of Portland. Watch for signs of of Dutch elm disease.

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Portland Urban Forestry Program Earns Global Recognition

Portland's volunteers put in more hours (over 7000) than any other US city! Urban Forestry is not the only one that noticed your hard work. The Arbor Day Foundation has awarded Portland its 44th Tree City USA Award, 24th Growth Award, and 2nd Tree Cities of the World Award.

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How to Identify Tree-of-Heaven

The Ailanthus altissima tree is commonly known as a Tree-of-Heaven. It can quickly grow to be a big problem. This is a guide to identify it.

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