skip to main content

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.

Class Schedule

Register for a class

Invasive Knotweed Control Workshop

Sponsored by City of Newcastle, Weed Warriors, King Conservation District and King County Noxious Weed Control Program 

September 19, 2015, 10 am to 1 pm

Fire Station #9, Conference Room, 12412 Newcastle Way, Newcastle WA 98056

Knotweed is a major problem in King County. This group of non-native, noxious weeds chokes out native vegetation, increases erosion, degrades water quality and hurts habitat for fish and wildlife. It can also damage roads, pipes and building foundations.

This free workshop is a cooperative effort with the Weed Warriors, City of Newcastle, King Conservation District, and King County Noxious Weed Program using Best Management Practices as outlined by the WA State Noxious Weed Board. Workshops like these demonstrate the willingness of concerned citizens, public entities and educators to tackle the difficult problem of invasive knotweed which negatively impacts our environment.

Workshop includes:

  • How invasive knotweed grows and spreads
  • How and where to control knotweed
  • What is being done to fight knotweed on rivers in King County
  • How to use and borrow a stem injector for use on your own land

The workshop is free and open to the public, but has limited capacity. SIGN UP TODAY!


To Reserve a Seat: Email Grace Stiller, Weed Warriors, or Angela Gallardo, City of Newcastle



The King County Noxious Weed Control Program offers workshops and presentations upon request for community groups, neighborhood councils, vegetation management professionals, volunteer events, garden clubs and a wide range of other groups. Please contact Sasha Shaw if you would like a presentation on invasive plants or noxious weeds for your group, staff or community.

Related information

Related agencies

Program offices are located at 201 S. Jackson St., Suite 600, Seattle, WA 98104. To contact staff, see the Noxious Weed Control Program Directory, send an email, or call 206-477-WEED (206-477-9333).