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The City of Portland, Oregon

Portland Parks & Recreation

Healthy Parks, Healthy Portland

Phone: 503-823-7529

1120 SW Fifth Avenue, Portland, OR 97204

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Invasive Tree Alert--You Can Help!

By Lee Greer, Tree Steward, Sunnyside Street Tree Team

Do you recognize this plant? It’s a young tree-of-heaven (Ailanthus altissima), a nuisance tree that can crowd out native plants and others we want in our gardens. It can also damage sidewalks, streets, foundations and sewers. It’s especially problematic because when you cut it down, it aggressively tries to reestablish itself by prolific root sprouting.

The Sunnyside Street Tree Team (S2T2) Tree-of-Heaven Information Project is working to educate the community about this tree, which we see invading parts of our neighborhood. We will be inventorying in Sunnyside any tree-of-heaven visible from the public right-of-way and leaving information for residents where we see the tree.

Would you like to join us in our inventory? If so, e-mail us at for more information or to volunteer.