Invasive Weeds

This informative video gives step by step instructions on how to manually remove knotweed from your property.

English Ivy strangling treesInvasive weeds significantly impact landowners around West Multnomah County and throughout Oregon. Noxious weeds displace native and desirable plants and wildlife habitat. They also negatively affect timber and agricultural production.

West Multnomah Soil & Water Conservation District (WMSWCD) has a comprehensive plan to deal with this important natural resource issue.

The plan uses the following tools:

  • Inventory
  • Assessment
  • Coordination
  • Education & Outreach

English Ivy strangling trees

  • Control
  • Restoration

The District Invasive Weed Program has four main focus areas that help direct program efforts:

  • Multnomah Weed Watchers/Early Detection and Rapid Response Program (EDRR)
  • Strategic Partnerships
  • Educational Demonstration Projects
  • English Ivy in Forest Park
  • Wildlife Corridor & Declining Habitat Focus

How to Spot Invasive Weeds

  1. Look in “disturbed” areas such as ditches, roadways, pastures, and recently developed areas.
  2. Attend a Multnomah Weed Watchers workshop to learn how to identify and report some of the most troublesome new invasive plants (Early Detection and Rapid Response).

What You Can Do

  1. Know your plants, particularly invasives
  2. Control invasive plants on your property and encourage your neighbors to do so
  3. Avoid disturbing natural areas and dumping invasives in yard waste
  4. Use as many native plants as possible in landscaping
  5. Report invasive plant sightings at




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