To offer a suggestion or report an error on the King County Noxious Weeds Web site, please contact Sasha Shaw, education specialist.
Water Primrose Ludwigia hexapetala
This aquatic Class B noxious weed has been observed occasionally in King County, Washington. The largest infestations of water primrose in the state are in southwest Washington where there are extensive mats of this weed along channels in the lower Columbia River area. Control is required in King County.
Program offices are located at 201 S. Jackson St., Suite 600, Seattle, WA 98104. To contact a staff member at the King County Noxious Weed Control Program, please call 206-296-0290 or by reach them by email.
This aquatic Class B noxious weed has been observed occasionally in King County, Washington. The largest infestations of water primrose in the state are in southwest Washington where there are extensive mats of this weed along channels in the lower Columbia River area. Control is required in King County. 
for water primrose.
