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Noxious weeds

King County, Washington

To offer a suggestion or report an error on the King County Noxious Weeds website, please contact Sasha Shaw, education specialist.

Noxious weeds in King County

Quick Links

English Ivy - Hedera helix - click for ID and control information
English Ivy
Scotch Broom
Giant Hogweed
Himalayan Blackberry - Rubus armeniacus - click for ID and control information
Garlic Mustard - Alliaria petiolata - click for ID and control information
Garlic Mustard

Identify and learn about weeds and invasive plantsClick to report a noxious weed infestation in King County, Washington

Report an infestation

Please help us locate regulated Class A, B, and C noxious weeds in King County so we can work with the property owners and public agencies responsible to ensure the weeds are controlled effectively. We need your help to find early infestations while we still have a chance to stop them.

Control noxious weeds


About King County Noxious Weed Control Board

King County Noxious Weed Control Board Districts - click for Weed Board informationThe King County Noxious Weed Control Board is appointed by King County Council to carry out the mandates of the Washington State noxious weed control law, Chapter 17.10 RCW.  The board members are volunteers who reside in King County and who have an interest in and knowledge about agriculture and/or the natural resources of the county.  Each board member represents one of five King County weed districts.

About us

The King County Noxious Weed Control Program works throughout the county to prevent and reduce the economic, environmental and social impacts of noxious weeds in King County, Washington. The program's focus is to provide education and technical assistance to landowners and public agencies to help them find the best control options for noxious weeds on each site and to reduce the overall impact of noxious weeds throughout the county.

  • About us - Noxious Weed Control Program - describes who we are, what we do and frequently asked questions
  • Contact us with comments - we would like to hear from you about how our staff performed, how we responded to noxious weed reports, if our information is helpful, and anything else you would like to share with us about our program and our work.

To contact us, please see the staff directory for the King County Noxious Weed Control Program, call 206-477-WEED (206-477-9333) or send us an e-mail.  Program offices are located at 201 S. Jackson St., Suite 600, Seattle, WA 98104.

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News and announcements

Holly research and reports - presentations and meeting notes from English holly symposiumnew2

Knotweed Control Workshops - See Classes for locations and dates

Weed of the Month Garden Loosestrife - click for KC Weed NewsKC Weed News - Weed of the Month, weed tips, events, and news on noxious weeds in King County, Washington

Beware of the Giant Hogweed, the invasive plant that can cause burns and blisters. May 12, 2014 

City People's Garden Store first in King County to commit not to sell invasive plants, noxious weeds. King County/City of Seattle Press Release. April 9, 2014.

Noxious Weed Control Board meets Jan. 15 to determine 2014 King County noxious weed list. King County Press Release. December 16, 2013. King County Press Release. December 16, 2013.

How Climate Change is Helping Invasive Species Take Over. Smithsonian, December 2013. Invasive plants are blooming earlier with climate change.

The story of clematis:  Guest column, Islands' Sounder, December 19, 2013.

More Weed News . . .

Frequently asked questions

Related information