skip to main content

To offer a suggestion or report an error on the King County Noxious Weeds Web site, please contact Sasha Shaw, education specialist.
King County, Washington noxious weed identification and control

Water primrose
Ludwigia hexapetala

water primrose flowers and leavesThis 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 more information about water primrose, please see the Washington State Department of Ecology website.

If you find water primrose in King County, Washington please notify us through our online infestation form.

To find out where we have records of this weed in King County, Washington use our interactive noxious weed map and search Arc IMS Search Tool for water primrose.

Water primrose photos - click thumbnail for larger image

Water primrose (small) Water primrose (small)

Report water primrose in King County, Washington

Locate water primrose in King County, Washington

Related information

Related agencies

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.