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

Newcastle Knotweed Workshop

September 13, 10:00 AM - 2:00 PM
Location: SE May Creek Park Drive and 124th Ave SE. Newcastle, WA (park on 124th Ave NE by the large stand of knotweed)


  • How invasive knotweed grows and spreads
  • How and where to use different methods to control knotweed
  • How to borrow a knotweed stem injector for use on your own land
  • How to use a knotweed injector on real live knotweed! 

Staff from the King County Noxious Weed Control Program will teach how to identify knotweed, how and where it grows, and how to control it effectively using a variety of different methods. This is a hands-on workshop with practical control tips.  After the class, participants will get practice using the injectors on actual knotweed and help control this plant in Newcastle.

Participants will be eligible to borrow the county's knotweed stem injectors for use on their own knotweed.

Free and open to the public. To sign up or for more information, contact:
Grace Stiller, Newcastle Weed Warriors, 425-228-7927,

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).