Noxious Weeds Resources

Noxious weeds threaten the health of our natural areas. The Backyard Habitat Certification Program will help you learn to identify and remove the most damaging of these plant species.

4-County Cooperative Weed Management Area

The Clackamas, Clark, Multnomah, and Washington County Cooperative Weed Management Area is a partnership of organizations, agencies, and non-profits dedicated to combating noxious weeds across the region.

  • 4-County CWMA – website with extensive resources on area noxious weeds

Conservation Districts

Conservation districts can sometimes support larger sites by providing information and resources for restoration, weed removal, and farms.

Noxious Weed Resources

  • Invasive Plants Poster – noxious weeds poster by City of Portland
  • Invasive Specieswebsite, complete with informational videos and articles on noxious weeds, by West Multnomah Soil and Water Conservation District
  • Noxious Weed Information and Serviceswebsite by King County about noxious weed identification and control
  • Urban Weeds – website by East Multnomah Soil & Water Conservation District’s with extensive info on nuisance urban weeds
  • Weedwiseprogram and website by Clackamas Soil and Water Conservation District, packed with valuable information


  • Urban Weeds presentationrecorded presentation (2 hours) by EMSWCD about how to identify and remove common weeds (many of them on BHCP’s priority noxious weed list). Complete the registration form to receive a link to the recording.
  • Weed removal videos – short videos by WMSWCD on noxious weed ID & removal (i.e. blackberry, clematis, garlic mustard, holly, ivy, knotweed, spurge laurel, & scotch broom)
  • Removing Tree Ivy 101 – short video by Tryon Creek Watershed Council on how to remove tree ivy
  • The Silent Invasiondocumentary by OPB about noxious weeds