Skip to content
4-County Cooperative Weed Management Area
Cooperative Weed Management in Oregon and Washington
Menu
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
2023 Pull Together
Invasive Plant Information
Integrated Weed Maintenance Calendar
Western Invasives Network Interactive IPM 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
2022 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]
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
IMG_20200115_143646
