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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 Events Calendar
    • 2019 Pull Together
    • 2019 Portland Spring Home & Garden Show
  • Invasive Plant Information
    • 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
    • Outreach and Education
    • Mapping and Data
      • Priority Weed Coordination
      • Call For New Weed Observations
      • Invasive Plant Data Standards
    • Technical
  • 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
      • 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 Meeting-Clark County (March 13th, 2019)
  • How to Help
    • Sponsor Packet

Printable Guides to Weed Identification & Control

Impatiens of the Pacific Northwest

Integrated Pest Management Guide for Common Weeds

Thistles of the Willamette Valley

Questions? Contact us

info@4countycwma.org

503-210-6015

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