Land Plants - invasive

Tree of Heaven (Ailanthus altissima) on Aug 14, 2025

Submitter does not have a specimen

Description of specimen

Small beginning of the tree, could see the telltale “thumbs” on the leaves

Commentary

Hey Cristy,

Thanks for posting as it helps us understand the spread of these species through out the county. Unfortunately without a picture we can not confirm if your identification is correct. However you likely are as tree of heaven is widespread through out the county. Unfortunately due to this we do not have the funding to respond to Tree of Heaven reports. If you have access to the property her are some Best Management Practices for dealing with this plant.

https://conservationdistrict.org/2021/tree-of-heaven-isnt-heavenly.html

Coleman Hepner
Aug. 22, 2025, 7:53 a.m.

Remedy

Check out a really thorough guide regarding tree of heaven identification and control OSU’s Solve Pest Problems: https://solvepestproblems.oregonstate.edu/weeds/tree-of-heaven

The Portland metro-area Cooperative Weed Management Area also has some great best management practices for handling this weed The 4 County CWMA: https://4countycwma.org/assets/best-mgmt-practices/tree-of-heaven-bmp_final.pdf

Resources

https://solvepestproblems.oregonstate.edu/weeds/tree-of-heaven

https://4countycwma.org/assets/best-mgmt-practices/tree-of-heaven-bmp_final.pdf

Location

Tree of heaven. 2 little plants- one on the playground, one on the kids campus side of the building

Expert Reviewer

Coleman Hepner
Tualatin SWCD

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