Class A Weeds: Non-native species whose distribution ricefield bulrush Schoenoplectus hoary alyssum Berteroa incana in Washington is still limited. Preventing new infestations and mucronatus houndstongue Cynoglossum officinale eradicating existing infestations are the highest priority. sage, clary Salvia sclarea indigobush Amorpha fruticosa Eradication of all Class A plants is required by law. sage, Mediterranean Salvia aethiopis knapweed, black Centaurea nigra silverleaf nightshade Solanum elaeagnifolium knapweed, brown Centaurea jacea Class B Weeds: Non-native species presently limited to small-flowered jewelweed Impatiens parviflora portions of the State. Species are designated for required knapweed, diffuse Centaurea diffusa control in regions where they are not yet widespread. South American Limnobium laevigatum knapweed, meadow Centaurea × gerstlaueri Preventing new infestations in these areas is a high priority. spongeplant knapweed, Russian Rhaponticum repens In regions where a Class B species is already abundant, Spanish broom Spartium junceum knapweed, spotted Centaurea stoebe control is decided at the local level, with containment as the Syrian beancaper Zygophyllum fabago knotweed, Bohemian Fallopia × bohemica primary goal. Please contact your County Noxious Weed Texas blueweed Helianthus ciliaris knotweed, giant Fallopia sachalinensis Control Board to learn which species are designated for thistle, Italian Carduus pycnocephalus knotweed, Himalayan Persicaria wallichii control in your area. thistle, milk Silybum marianum knotweed, Japanese Fallopia japonica thistle, slenderflower Carduus tenuiflorus kochia Bassia scoparia Class C Weeds: Noxious weeds that are typically thistle, Turkish Carduus cinereus lesser celandine Ficaria verna widespread in WA or are of special interest to the state’s variable-leaf milfoil Myriophyllum agricultural industry. The Class C status allows county weed loosestrife, garden Lysimachia vulgaris heterophyllum boards to require control if locally desired, or they may loosestrife, purple Lythrum salicaria wild four-o'clock Mirabilis nyctaginea loosestrife, wand Lythrum virgatum choose to provide education or technical consultation.

Class B Weeds Malta starthistle Centaurea melitensis Class A Weeds parrotfeather Myriophyllum aquaticum blueweed Echium vulgare Eradication is required perennial pepperweed Lepidium latifolium Brazilian elodea Egeria densa common crupina Crupina vulgaris poison hemlock Conium maculatum bugloss, annual Lycopsis arvensis cordgrass, common Spartina anglica policeman’s helmet Impatiens glandulifera bugloss, common Anchusa officinalis cordgrass, dense-flowered Spartina densiflora puncturevine Tribulus terrestris butterfly bush Buddleja davidii cordgrass, saltmeadow Spartina patens Ravenna grass Tripidium ravennae camelthorn Alhagi maurorum cordgrass, smooth Spartina alterniflora rush skeletonweed Chondrilla juncea common fennel, (except Foeniculum vulgare except dyer’s woad Isatis tinctoria saltcedar Tamarix ramosissima bulbing fennel) F. vulgare var. azoricum) eggleaf spurge Euphorbia oblongata Scotch broom Cytisus scoparius false brome Brachypodium sylvaticum common reed (nonnative Phragmites australis genotypes only) shiny geranium Geranium lucidum floating primrose-willow Ludwigia peploides spurge flax Thymelaea passerina flowering rush Butomus umbellatus Dalmatian toadflax Linaria dalmatica ssp. dalmatica spurge laurel Daphne laureola French broom Genista monspessulana Eurasian watermilfoil Myriophyllum spicatum spurge, leafy Euphorbia virgata garlic mustard Alliaria petiolata European coltsfoot Tussilago farfara spurge, myrtle Euphorbia myrsinites giant hogweed Heracleum fanwort Cabomba caroliniana sulfur cinquefoil Potentilla recta mantegazzianum tansy ragwort Jacobaea vulgaris goatsrue Galega officinalis gorse Ulex europaeus grass-leaved arrowhead Sagittaria graminea thistle, musk Carduus nutans hydrilla Hydrilla verticillata thistle, plumeless Carduus acanthoides Johnsongrass Sorghum halepense hairy willowherb Epilobium hirsutum hawkweed oxtongue Picris hieracioides thistle, Scotch Onopordum acanthium knapweed, bighead Centaurea macrocephala velvetleaf Abutilon theophrasti knapweed, Vochin Centaurea nigrescens hawkweed, orange Hieracium aurantiacum hawkweeds: All nonnative Hieracium, subgenus water primrose Ludwigia hexapetala kudzu Pueraria montana var. white bryony Bryonia alba lobata species and hybrids of the Pilosella meadow subgenus wild chervil Anthriscus sylvestris meadow clary Salvia pratensis hawkweeds: All nonnative Hieracium, subgenus yellow archangel Lamiastrum galeobdolon oriental clematis Clematis orientalis species and hybrids of the Hieracium yellow floatingheart Nymphoides peltata purple starthistle Centaurea calcitrapa wall subgenus yellow nutsedge Cyperus esculentus reed sweetgrass Glyceria maxima herb-Robert Geranium robertianum yellow starthistle Centaurea solstitialis Class C Weeds Class C Weeds continued absinth wormwood Artemisia absinthium Russian olive Elaeagnus angustifolia 2021 Austrian fieldcress Rorippa austriaca scentless mayweed Tripleurospermum babysbreath Gypsophila paniculata inodorum black henbane Hyoscyamus niger smoothseed alfalfa dodder Cuscuta approximata Washington State blackgrass Alopecurus myosuroides spikeweed Centromadia pungens buffalobur Solanum rostratum spiny cocklebur Xanthium spinosum Noxious Weed List cereal rye Secale cereale spotted jewelweed Impatiens capensis common barberry Berberis vulgaris Swainsonpea Sphaerophysa salsula common catsear Hypochaeris radicata thistle, bull Cirsium vulgare common groundsel Senecio vulgaris thistle, Canada Cirsium arvense common St. Johnswort Hypericum perforatum tree-of-heaven Ailanthus altissima common tansy Tanacetum vulgare ventenata Ventenata dubia common teasel Dipsacus fullonum white cockle Silene latifolia curlyleaf pondweed Potamogeton crispus wild carrot (except where Daucus carota English hawthorn Crataegus monogyna commercially grown) English ivy - four cultivars Hedera helix ‘Baltica’, yellow flag iris Iris pseudacorus only ‘Pittsburgh’, and ‘Star’, and yellow toadflax Linaria vulgaris H. hibernica ‘Hibernica’ Eurasian watermilfoil Myriophyllum spicatum x To learn more about noxious weeds and hybrid Myriophyllum sibiricum noxious weed control in Washington State, evergreen blackberry Rubus laciniatus please contact: field bindweed Convolvulus arvensis fragrant waterlily Nymphaea odorata WA State Noxious Weed Control Board hairy whitetop Lepidium appelianum P.O. Box 42560 Himalayan blackberry Rubus bifrons (Rubus Olympia, WA 98504-2560 armeniacus) (360) 725-5764 hoary cress Lepidium draba Turkish thistle, Carduus cinereus, is a new Email: [email protected] Italian arum Arum italicum Class A noxious weed for 2021. This Japanese eelgrass Nanozostera japonica Website: http://www.nwcb.wa.gov annual thistle is found close to jubata grass Cortaderia jubata Or Washington in northeastern Oregon and jointed goatgrass Aegilops cylindrica the adjacent area in Idaho. Eradication is lawnweed Soliva sessilis WA State Department of Agriculture required of Turkish thistle when found in longspine sandbur Cenchrus longispinus (509) 249-6973 medusahead Taeniatherum caput- Washington. Or medusae nonnative cattail species Typha species Your County Noxious Weed Control List arranged alphabetically by: and hybrids (reminder, Board COMMON NAME does not include the native common cattail, Please help protect Washington’s economy Typha latifolia) and environment from noxious weeds! old man's beard Clematis vitalba oxeye daisy Leucanthemum vulgare Cover photo of Turkish thistle by Mark Porter, Oregon Pampas grass Cortaderia selloana Department of Agriculture perennial sowthistle Sonchus arvensis reed canarygrass Phalaris arundinacea