This Class A noxious weed was added to the State Noxious Weed List in 2003.

It has a very limited distribution in Washington State. It was discovered in the North Bay area of Grays Harbor and it was found at Race Lagoon, near Penn Cove on Whidbey Island. For more information on noxious weed regulations and definitions, see Noxious weed lists and laws.

Unlike other Spartina species, S. densiflora does not have rhizomes. Spread is by seed or by vegetative growth.

Additional information on dense-flowered cordgrass

• Washington State Noxious Weed Control Board (external link)
• WSDA Spartina Program

What to do if you find this plant in King County, Washington

Please notify us if you see dense-flowered cordgrass growing in King County. Our program staff can provide the property owner or appropriate public agency with site-specific advice on how best to remove it. We map all known locations of regulated noxious weeds such as dense-flowered cordgrass in order to help us and others locate new infestations in time to control them.

Dense-flowered cordgrass photos

Report dense-flowered cordgrass in King County, Washington

• Please notify us through our online infestation form

Locate dense-flowered cordgrass in King County, Washington

• Use our interactive noxious weed map and search for dense-flowered cordgrass

Related information

• Agriculture in King County, Washington
• Northwest yard and garden
• Animals, plants and habitat

Related agencies

• Dept. of Natural Resources and Parks
• Water and Land Resources Division

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).