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Featured Weeds

Program Contact: Kiley Smith, Grays Harbor County Weed Board Coordinator
(360) 482-2265 •

Invasive Weeds


These featured weeds are an example of some of the more common noxious weeds you may find on your property. It’s a good idea to familiarize yourself with these due to the rapid rate at which these can spread and take over.

We encourage you to contact your local Grays Harbor Noxious Weed Control Board to discuss the methods of controlling and eradicating these weeds from your property.


Knotweed spp.










Learn about knotweed control here


Tansy ragwort

















Learn about tansy ragwort control here


Scotch broom

The Grays Harbor Noxious Weed Control Board has weed wrenches available to rent for free!

Learn about Scotch broom control here


English ivy

Learn about English ivy control here



Learn about gorse control here


Blackberry spp.

Himalayan blackberry

Evergreen blackberry

Learn about blackberry control here


Poison hemlock

Learn about poison hemlock control here


Italian arum

Learn about Italian arum control here


Butterfly bush

Learn about butterfly bush control here


Canada thistle

Learn about Canada thistle control here


Boater Education Project

Stop aquatic hitchhikers. Prevent the transport of nuisance species. Clean all recreational equipment before moving to a different area. When you leave a body of water: Remove any visible mud, plants, animals, before transporting equipment.…
Phragmites australis

Common Reed

Phragmites australis Grays Harbor is experiencing an alien invasion, of non-native common reed. This grass gets 16 feet tall and forms thick stands at the water's edge. The Grays Harbor National Wildlife Refuge is threatened…
Sandmat - Cardionema


Scotch broom, gorse, and thistle all seem to love the beach. Special care must be taken when applying any herbicides to sandy soils - herbicides can be washed into groundwater fairly easliy. The best defense…


What is knotweed? Knotweed is the 800 pound elephant of northwest weeds. Knotweeds are perennial plants native to Asia. The plants were brought here as ornamentals in gardens. This plant or group of plants, including:…