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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.

Class Schedule

Register for a class

What is Knotweed and How Can I Get Rid of it?

All sessions are from 6:30 pm to 8:30 pm and have the same agenda:

Cost: Free (pre-registration required)
How to sign up: Register online
Credits: WSDA Pesticide License Recertification Credits will be available (2 credits)

Invasive knotweed is one of the toughest weed thugs around and it is becoming all too common in King County. It chokes out everything else, increases erosion and overwhelms riverbanks. Fighting it is frustrating without effective methods and tools. This workshop will explain why this plant is so tough to stop and what it takes to control it.

FIND OUT:

  • 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
  • What is being done to fight knotweed on rivers in King County

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

2015 Noxious Weed Control Seminar

Session Dates and Locations (Sorry - all remaining sessions for 2015 are now full)

Cost: Free (pre-registration required)
How to sign up: Full - click for wait list
Credits: WSDA Pesticide License Recertification Credits will be available (see below for number)

Presenters: The 2015 agenda features noxious weed control identification and control information from the county's noxious weed specialists and live weed specimens on display, as well as special guest presentations by Alison Halpern, director of the Washington State Noxious Weed Control Board and Dr. Tim Miller, weed science researcher with WSU Extension.

At all sessions except May 6 (South Session), there will be an additional afternoon workshop featuring a tutorial on using backpack sprayers and a knotweed control and injector training presented by noxious weed program staff. Participants in the knotweed injector training will qualify to borrow the program’s knotweed injectors.  The May 6 South Session will end at 12:30.

Seminar Schedule:

Morning Session (available on all four dates; 5 credits)

7:30-8:00

Registration, refreshments and self-guided weed quiz

8:00-8:20

Weed List Updates and New Listed Species, Sasha Shaw, King County Noxious Weed Program

8:20-9:20

Noxious Weed ID and Control Part One, Noxious Weed Program Staff

9:20-9:30

BREAK

9:30-10:20

Bees and Weed Control: How to Have Both, Alison Halpern, Washington State Noxious Weed Control Board

10:20-11:10

Research Results from Dr. Tim: Yellow Archangel, Knotweed, Butterfly Bush and Italian Arum, Dr. Tim Miller, WSU Extension

11:10-11:20

BREAK

11:20-12:30

Noxious Weed ID and Control Part Two, King County Noxious Weed Program Staff

12:30-1:30

LUNCH - Bring your own

Afternoon Session (not available on May 6, will be available on May 13, 20 and June 9; 2 credits)

1:30-2:20

Backpack Spraying 101: Mixing, Calibrating, Cleaning and Maintenance, King County Noxious Weed Program Staff

2:30-3:20

Knotweed Control and Injector Training (participants will qualify to borrow the program’s knotweed injectors), King County Noxious Weed Program Staff

 

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).