Land Plants - invasive

Tree of Heaven (Ailanthus altissima) on Sep 24, 2025

Submitter does not have a specimen

Description of specimen

Massive mature Tree of Heaven, along with many additional smaller offshoots.

Commentary

None

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

The whole lot here is overgrown with Tree of Heaven, including a huge mature one about to drop a crazy amount of seedlings. Adjacent properties are also infested, the one just north on 15th badly.

Expert Reviewer

Jacob Rose
Institute for Natural Resources

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