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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?

Prevent Seed Spread

garlic mustardGarlic mustard seeds move easily along streams and roads, and readily colonize disturbed soil. Hiking boots and vehicle tires are a well-documented means of spreading these seeds. So, you can keep new patches from popping up in your neighborhood yards and parks by cleaning your shoes after walking in areas of known garlic mustard infestations.

Control Where it Grows

  • Pulling: Digging up garlic mustard on private property can be effective, but requires weekly attention to catch new plants. Pulled plants will continue to flower and set seed. Be sure to bag them and put them in the garbage (not in your yard debris!!). BE SURE TO GET ALL THE ROOTS.
  • Cutting: don’t cut or mow. Leftover roots can regrow; cut plants may still flower and set seed.
  • Spraying: may not be necessary on patches. The City of Portland does this mostly along roadsides, where miles of work prohibits effective pulling.

Report Private Patches

If you’ve got it on your property, and it’s too much to pull, let us know. We may be able to help. You can download a Permit of Entry form, fill it out and return it by the end of April and we will treat garlic mustard on your property in May or June. If the treatment season has ended, we will add your name to our treatment inventory for the following spring.