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4-County Cooperative Weed Management Area

4-County Cooperative Weed Management Area

Cooperative Weed Management in Oregon and Washington

  • The Lobby
    • Why Invasives Are a Problem
      • Reduced Biodiversity/Increased Monoculture
        • Stormwater Infiltration
        • Forest Failure
      • Economic Loss
      • Erosion
      • Human Health
    • Why the Landscape Matters
      • We’re Urban
      • We’re Rural
      • We’re Forested
    • What Management Looks Like
    • Why Collaboration Is Important
    • Our Memorandum of Understanding
    • Our Partners
    • Our Management Plan
    • Our 4-County Map
  • The Latest Dirt
  • Events
    • CWMA Calendar
    • 2022 Pull Together
  • Invasive Plant Information
    • Integrated Weed Maintenance Calendar
    • Weed Management Fact Sheets
      • Hojas Informativas de Plantas Invasivas
    • Best Management Practices
      • American Pokeweed
      • Canada Thistle
      • Cutleaf/Himalayan Blackberry
      • False Brome
      • Garlic Mustard
      • Giant Hogweed
      • Hawkweeds
      • Indigobush
      • English, Irish, and Persian Ivy
      • Lesser Celandine
      • Old Man’s Beard
      • Knotweeds
      • Meadow Knapweed
      • Puncturevine
      • Reed Canarygrass
      • Rush Skeletonweed
      • Scotch Broom
      • Spurge Laurel
      • Tansy Ragwort
      • Tree of Heaven
      • Water Primrose
      • Yellow Archangel
    • Weed Identification and Control Websites
      • CDFA Encycloweedia
      • USDA/NRCS Introduced, Invasive, and Noxious Plants
      • King County Noxious Weed Identification and Control
      • Oregon Invasive Species Council
      • ODA Noxious Weed Profiles
      • OPB The Silent Invasion
      • OSU Herbarium- Oregon State University
      • Washington State Noxious Weed Control Board
    • Printable Guides to Weed Identification & Control
  • Our Committees
    • Steering
    • Education and Outreach
    • Mapping and Data
      • Priority Weed Coordination
      • Call-for-Data Weeds
      • Reporting & Sharing Your Weed Data
      • Invasive Plant Data Standards
      • Data Sharing Contest Entry 2022
    • Technical and Scientific Review
  • Seed Bank
    • Past Events
      • Pull Together
        • 2012 Pull Together
        • 2013 Pull Together
        • 2014 Pull Together
        • 2015 Pull Together
        • 2016 Pull Together
        • 2017 Pull Together
        • 2018 Pull Together
        • 2019 Pull Together
        • 2020 Pull Together
        • 2021 Pull Together
      • Portland Spring Home & Garden Show
        • 2019 Portland Spring Home & Garden Show
      • Garlic Mustard Working Group
        • 2014 Garlic Mustard Working Group
        • 2015 Garlic Mustard Working Group
        • 2017 Garlic Mustard Working Group
        • 2018 Garlic Mustard Working Group
      • Herbicide Forum
        • 2013 Herbicide Roundtable
        • 2014 Herbicide Roundtable [March]
        • 2014 Herbicide Forum [December]
        • 2015 Herbicide Forum
    • Past Meetings
      • General Meetings
      • Steering Committee Meetings
      • Education & Outreach Committee Meetings
      • Mapping & Data Committee Meetings
      • Technical & Scientific Review Committee Meetings
  • How to Help
    • Support the CWMA
    • Member Packet

Printable Guides to Weed Identification & Control

Impatiens of the Pacific Northwest

Integrated Pest Management Guide for Common Weeds

Thistles of the Willamette Valley

Stay in the loop!

Join our email list to receive CWMA updates, regional weed information, and more!

Questions? Contact us

info@4countycwma.org

503-210-6015

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