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

Non-Regulated Noxious Weeds, 2009 List
(non-designate Class B and C noxious weeds, control recommended but not required in King County)

Scientific Name Common Name
Artemisia absinthium absinth wormwood
Buddleia davidii  butterfly bush
Cardaria draba hoary cress
Cardaria pubescens hairy whitetop
Cirsium arvense Canada thistle
Cirsium vulgare Cirsium vulgare bull thistle
Clematis vitalba old man's beard
Conium maculatum poison-hemlock
Convolvulus arvensis field bindweed
Cynoglossum officinale houndstongue
Cytisus scoparius Scotch broom (required SR-2, I-90 E. of MP 34)
Daphne laureola spurge laurel
Daucus carota wild carrot
Euphorbia myrsinites myrtle spurge
Foeniculum vulgare common fennel (except bulbing variety azoricum)
Geranium robertianum herb Robert
Hedera helix Baltica English ivy
Hedera helix Pittsburgh English ivy
Hedera helix Star English ivy
Hedera hibernica Atlantic ivy
Hypericum perforatum common St. Johnswort
Iris pseudacorus yellow flag iris
Lamiastrum galeobdolon yellow archangel
Leucanthemum vulgare oxeye daisy
Linaria vulgaris yellow toadflax
Myriophyllum spicatum Eurasian watermilfoil
Nymphaea odorata fragrant water lily
Phalaris arundinacea reed canarygrass
Polygonum bohemicum* Bohemian knotweed
Polygonum sachalinense* giant knotweed
Polygonum polystachyum* Himalayan knotweed
Polygonum cuspidatum* Japanese knotweed
Potamogeton crispus curly-leaf pondweed
Rubus armeniacus Himalayan blackberry
Rubus laciniatus evergreen blackberry
Senecio vulgaris common groundsel
Soliva sessilis lawnweed
Tanacetum vulgare common tansy

*Control of Bohemian, Japanese, giant and Himalayan knotweed is required on the Green River and its tributaries (defined as Type S, F or N aquatic areas in KCC 21A.24.355) upstream of the Auburn City Limits, including but not limited to Newaukum Creek, Soos Creek, Big Soos Creek, Jenkins Creek, Covington Creek, and Crisp Creek. Control of these invasive knotweed species is required up to the ordinary high water mark (or up to the top of the bank if the ordinary high water mark cannot be identified) and in the adjacent buffer area as specified in KCC 21A.24.358.

King County Noxious Weed List

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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.