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Environmental Services

working for clean rivers

Phone: 503-823-7740

Fax: 503-823-6995

1120 SW 5th Avenue, Room 1000, Portland, OR 97204

More Contact Info

What can folks do about it?

orange hawkweedControl where it goes

Be aware of all the species in wildflower mixes, and refuse to plant or take unlabeled mixes. Keep existing populations from going to seed by treating them in a timely way.

Control where it grows

  • Dig: digging orange hawkweed can be effective, but care must be taken to remove all the root.
  • Treat: trials are currently being conducted in Portland to find the most effective herbicide, rate, and timing.
  • Check: monitor the site at least annually, to confirm whether or not rosettes are dying off.

Last words

If you suspect you’ve found orange hawkweed, the Oregon Department of Agriculture, and the City of Portland both REQUIRE you to report it.  You can report suspected patches to:

  • the Oregon Department of Agriculture at 1-866-INVADER (1-866-468-2337), or;
  • Mitch Bixby with the Environmental Services' Early Detection/Rapid Response Program at 503-823-2989 or mitch.bixby@portlandoregon.gov

The City of Portland offers assistance with managing orange hawkweed if you would like it.