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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.

News article

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.

Blog post

Californians in Oregon: How Do Sequoias and Redwoods Do in Portland?

Giant sequoia and coast redwood trees are often found in California. They can also be found growing in Portland's urban forest.

Blog post

Tree Physiology Primer – All About Roots!

A brief review of tree parts and how a tree functions.

Blog post

Trees and Sidewalks - Healthy Roots, Healthy Tree

Information on tree roots and sidewalks.

Blog post

12 Broadleaf Evergreen Street Trees You Should Plant

Learn about a selection of trees that keep their leaves all year, and do well in Portland.

Blog post

Make Your First Day Hike Local!

Start off the new year with a stay-local First Day Hike tree walk that you can share with neighbors. Keep exploring the trees of our City in a different way; learn a new approach to tree identification through their buds, bark, and branching.

Updated News article