To offer a suggestion or report an error on the King County Noxious Weeds Web site, please contact Sasha Shaw, education specialist.
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View by Scientific Name » 2009 King County Noxious Weed List
Class A Noxious Weeds, 2009 List
(eradication required throughout Washington State including King County) |
| Common Name | Scientific Name |
|---|
| buffalobur |
Solanum rostratum |
| common crupina |
Crupina vulgaris |
| cordgrass, common |
Spartina anglica |
| cordgrass, dense flower |
Spartina densiflora |
| cordgrass, salt meadow |
Spartina patens |
| cordgrass, smooth |
Spartina alterniflora |
| dyers woad |
Isatis tinctoria |
| eggleaf spurge |
Euphorbia oblongata |
| false brome |
Brachypodium sylvaticum |
| floating primrose-willow |
Ludwigia peploides |
| flowering-rush |
Butomus umbellatus |
| garlic mustard |
Alliaria petiolata |
| giant hogweed |
Heracleum mantegazzianum |
| goatsrue |
Galega officinalis |
| hawkweed, European |
Hieracium sabaudum |
| hawkweed, yellow devil |
Hieracium floribundum |
| hydrilla |
Hydrilla verticillata |
| johnsongrass |
Sorghum halepense |
| knapweed, bighead |
Centaurea macrocephala |
| knapweed, Vochin |
Centaurea nigrescens |
| kudzu |
Pueraria montana var. lobata |
| meadow clary |
Salvia pratensis |
| purple starthistle |
Centaurea calcitrapa |
| reed sweetgrass |
Glyceria maxima |
| ricefield bulrush |
Schoenoplectus mucronatus |
| sage, clary |
Salvia sclarea |
| sage, Mediterranean |
Salvia aethiopis |
| shiny geranium |
Geranium lucidum |
| silverleaf nightshade |
Solanum elaeagnifolium |
| Spanish broom |
Spartium junceum |
| spurge flax |
Thymelaea passerina |
| Syrian bean-caper |
Zygophyllum fabago |
| Texas blueweed |
Helianthus ciliaris |
| thistle, Italian |
Carduus pycnocephalus |
| thistle, milk |
Silybum marianum |
| thistle, slenderflower |
Carduus tenuiflorus |
| variable-leaf milfoil |
Myriophyllum heterophyllum |
| velvetleaf |
Abutilon theophrasti |
| wild four o'clock |
Mirabilis nyctaginea |
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Class B Noxious Weeds, 2009 List
(control required in King County) |
| Common Name | Scientific Name |
|---|
| Austrian fieldcress |
Rorippa austriaca |
| blackgrass |
Alopecurus myosuroides |
| blueweed, viper's bugloss |
Echium vulgare |
| Brazilian elodea* |
Egeria densa |
| bugloss, annual |
Anchusa arvensis |
| bugloss, common |
Anchusa officinalis |
| camelthorn |
Alhagi maurorum |
| common reed (non-native genotypes) |
Phragmites australis |
| Dalmatian toadflax |
Linaria dalmatica ssp. dalmatica |
| fanwort |
Cabomba caroliniana |
| gorse |
Ulex europaeus |
| grass-leaved arrowhead |
Sagittaria graminea |
| hawkweed, oxtongue |
Picris hieracioides |
| hawkweed, mouseear |
Hieracium pilosella |
| hawkweed, orange |
Hieracium aurantiacum |
| hawkweed, polar |
Hieracium atratum |
| hawkweed, queen-devil |
Hieracium glomeratum |
| hawkweed, smooth |
Hieracium laevigatum |
| hawkweed, yellow |
Hieracium caespitosum |
| hoary alyssum |
Berteroa incana |
| knapweed, black |
Centaurea nigra |
| knapweed, brown |
Centaurea jacea |
| knapweed, diffuse |
Centaurea diffusa |
| knapweed, meadow |
Centaurea jacea x nigra |
| knapweed, Russian |
Acroptilon repens |
| knapweed, spotted |
Centaurea stoebe |
| kochia |
Kochia scoparia |
| lepyrodiclis |
Lepyrodiclis holosteoides |
| longspine sandbur |
Cenchrus longispinus |
| loosestrife, garden |
Lysimachia vulgaris |
| loosestrife, purple |
Lythrum salicaria |
| parrotfeather |
Myriophyllum aquaticum |
| perennial pepperweed |
Lepidium latifolium |
| perennial sowthistle |
Sonchus arvensis |
| policeman's helmet |
Impatiens glandulifera |
| rush skeletonweed |
Chondrilla juncea |
| saltcedar |
Tamarix ramosissima |
| spurge, leafy |
Euphorbia esula |
| sulfur cinquefoil |
Potentilla recta |
| swainsonpea |
Sphaerophysa salsula |
| tansy ragwort |
Senecio jacobaea |
| thistle, musk |
Carduus nutans |
| thistle, plumeless |
Carduus acanthoides |
| thistle, Scotch |
Onopordum acanthium |
| water primrose |
Ludwigia hexapetala |
| white bryony |
Bryonia alba |
| wild chervil |
Anthriscus sylvestris |
| yellow floating heart |
Nymphoides peltata |
| yellow nutsedge |
Cyperus esculentus |
| yellow starthistle |
Centaurea solstitialis |
| *Brazilian elodea is designated for control throughout King County except in Lake Washington, Lake Sammamish, Lake Union and Lake Fenwick. |
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Class C Noxious Weeds, 2009 List
(control required in King County) |
| Common Name | Scientific Name |
|---|
| hairy willow-herb |
Epilobium hirsutum |
| hawkweed, common |
Hieracium lachenalii |
| hawkweeds, non-native and invasive |
Hieracium spp. |
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Non-Regulated Noxious Weeds, 2009 List
(non-designate B and C noxious weeds, control recommended but not required in King County) |
| Common Name | Scientific Name |
|---|
| absinth wormwood |
Artemisia absinthium |
| blackberry, evergreen |
Rubus laciniatus |
| blackberry, Himalayan |
Rubus armeniacus |
| butterfly bush |
Buddleia davidii |
| common fennel (except bulbing variety azoricum) |
Foeniculum vulgare |
| common groundsel |
Senecio vulgaris |
| common St. Johnswort |
Hypericum perforatum |
| common tansy |
Tanacetum vulgare |
| curly-leaf pondweed |
Potamogeton crispus |
| Eurasian watermilfoil |
Myriophyllum spicatum |
| field bindweed |
Convolvulus arvensis |
| fragrant water lily |
Nymphaea odorata |
| hairy whitetop |
Cardaria pubescens |
| herb Robert |
Geranium robertianum |
| hoary cress |
Cardaria draba |
| houndstongue |
Cynoglossum officinale |
| ivy, Atlantic |
Hedera hibernica |
| ivy, English |
Hedera helix 'Baltica', Hedera helix 'Pittsburgh', Hedera helix 'Star' |
knotweed, Bohemian* |
Polygonum bohemicum |
| knotweed, giant* |
Polygonum sachalinense |
| knotweed, Himalayan* |
Polygonum polystachyum |
| knotweed, Japanese* |
Polygonum cuspidatum |
| lawnweed |
Soliva sessilis |
| myrtle spurge |
Euphorbia myrsinites |
| old man's beard |
Clematis vitalba |
| oxeye daisy |
Leucanthemum vulgare |
| poison-hemlock |
Conium maculatum |
| reed canarygrass |
Phalaris arundinacea |
| Scotch broom (required SR-2, I-90 E. of MP 34) |
Cytisus scoparius |
| spurge laurel |
Daphne laureola |
| thistle, bull |
Cirsium vulgare |
| thistle, Canada |
Cirsium arvense |
| wild carrot |
Daucus carota |
| yellow archangel |
Lamiastrum galeobdolon |
| yellow flag iris |
Iris pseudacorus |
| yellow toadflax |
Linaria vulgaris |
| *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. |
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King County Weeds of Concern, 2009 List
(This list is for educational purposes only; these species are not classified as noxious weeds in Washington State. These species often impact and degrade native plant and animal habitat. Control is recommended where possible and new plantings are discouraged.) |
| Common Name | Scientific Name |
|---|
| bittersweet nightshade |
Solanum dulcamara |
| buttercup, creeping |
Ranunculus repens |
| buttercup, tall |
Ranunculus acris |
| common hawthorn |
Crataegus monogyna |
| English holly |
Ilex aquifolium |
| English laurel |
Prunus laurocerasus |
| European mountain-ash |
Sorbus aucuparia |
| hedge bindweed, morning glory |
Calystegia sepium |
| spotted jewelweed |
Impatiens capensis |
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