To offer a suggestion or report an error on the Water and Land Resources' Web site, please contact Fred Bentler, webmaster. |
IdentificationStems are stout, cane-like, and reddish-brown. The plants die back at the end of the growing season but their old reddish-brown canes often persist. The stem nodes are swollen and surrounded by thin papery sheaths. Leaves are either heart-shaped or spade-shaped or somewhere in between. The flowers are small, creamy white to greenish white, and grow in showy plume-like, branched clusters from leaf axils near the ends of the stems. The fruit is 3-sided, black and shiny.
County-led Knotweed Control ProjectsControl of knotweed is challenging and often requires a watershed approach to be effective along waterways. The King County Noxious Weed Control Program is engaged in several cooperative weed managment projects in the county to tackle this difficult weed along certain waterways with assistance from local landowners and state and federal grants. For information on these projects, please see our Reports page or contact our office and ask to speak with the Knotweed Program Manager. For More InformationFor detailed information on invasive knotweed, download a slide show on knotweed biology and control (3.12 MB, Power Point, may take several minutes to complete download) or see our handout covering the same information in text format, Knotweed Biology and Control (44 KB Acrobat file). Read the Invasive Knotweed Weed Alert for general information on identification and control (1.27 MB Acrobat file) or for comprehensive biology and control information, download the Invasive Knotweed Best Management Practices (281 KB Acrobat file). Also see the written findings of the WA State Noxious Weed Control Board for more information on Japanese and Bohemian knotweed.
|
|