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himalayan knotweed plant with flowers A Class B weed in Washington State, this aggressive competitor in the Buckwheat Family was introduced from Asia as an ornamental. Control of this plant in King County is not required but strongly recommended.

For more information about Himalayan knotweed, please see the written findings of the WA State Noxious Weed Control Board.

Read an informational handout on Himalayan knotweed (156 KB Acrobat file, 22 seconds on 56K modem) or for comprehensive biology and control information, download the Invasive Knotweed Best Management Practices (281 KB Acrobat file).

 
Please direct questions & comments regarding noxious weeds to Program Staff, King County Noxious Weed Control Program.

For questions about the
Water and Land Resources Web Site, please contact Fred Bentler, webmaster.


Department of Natural Resources
Water and Land Resources Division

Updated: March 10, 2008

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