2024 Washington State Noxious Weed List.pdf

Class A Weeds: Non-native species whose distribution in Washington is still limited. Preventing new infestations and eradicating existing infestations are the highest priority.

Eradication of all Class A plants is required by law.

Class B Weeds: Non-native species presently limited to portions of the State. Species are designated for required control in regions where they are not yet widespread.

Preventing new infestations in these areas is a high priority.

In regions where a Class B species is already abundant, control is decided at the local level, with containment as the primary goal. Please contact your County Noxious Weed Control Board to learn which species are designated for control in your area.

Class C Weeds: Noxious weeds that are typically widespread in WA or are of special interest to the state’s agricultural industry. The Class C status allows county weed boards to require control if locally desired, or they may choose to provide education or technical consultation.

Class A Weeds Eradication is required common crupina Crupina vulgaris cordgrass, common Spartina anglica cordgrass, dense-flowered Spartina densiflora cordgrass, saltmeadow Spartina patens cordgrass, smooth Spartina alterniflora dyer’s woad Isatis tinctoria eggleaf spurge Euphorbia oblongata false brome Brachypodium sylvaticum floating primrose-willow Ludwigia peploides flowering rush Butomus umbellatus French broom Genista monspessulana garlic mustard Alliaria petiolata giant hogweed Heracleum mantegazzianum goatsrue Galega officinalis hydrilla Hydrilla verticillata Johnsongrass Sorghum halepense knapweed, bighead Centaurea macrocephala knapweed, Vochin Centaurea nigrescens kudzu Pueraria montana var.

lobata meadow clary Salvia pratensis oriental clematis Clematis orientalis Palmer amaranth Amaranthus palmeri purple starthistle Centaurea calcitrapa reed sweetgrass Glyceria maxima ricefield bulrush Schoenoplectus mucronatus sage, clary Salvia sclarea sage, Mediterranean Salvia aethiopis silverleaf nightshade Solanum elaeagnifolium small-flowered jewelweed Impatiens parviflora South American spongeplant

Limnobium laevigatum

Spanish broom Spartium junceum Syrian beancaper Zygophyllum fabago Texas blueweed Helianthus ciliaris thistle, Italian Carduus pycnocephalus thistle, milk Silybum marianum thistle, slenderflower Carduus tenuiflorus thistle, Turkish Carduus cinereus variable-leaf milfoil and hybrid

Myriophyllum heterophyllum and M.

heterophyllum x M.

hippuroides wild four-o'clock Mirabilis nyctaginea

Class B Weeds blueweed Echium vulgare Brazilian elodea Egeria densa bugloss, annual Lycopsis arvensis bugloss, common Anchusa officinalis butterfly bush Buddleja davidii camelthorn Alhagi maurorum common fennel, (except bulbing fennel)

Foeniculum vulgare except F. vulgare var. azoricum) common reed (nonnative genotypes only)

Phragmites australis common tansy Tanacetum vulgare Dalmatian toadflax Linaria dalmatica ssp.

dalmatica Eurasian watermilfoil Myriophyllum spicatum European coltsfoot Tussilago farfara fanwort Cabomba caroliniana gorse Ulex europaeus grass-leaved arrowhead Sagittaria graminea hairy willowherb Epilobium hirsutum hanging sedge Carex pendula, Carex pendula subsp. pendula and Carex pendula subsp.

agastachys hawkweed oxtongue Picris hieracioides hawkweed, orange Hieracium aurantiacum hawkweeds: All nonnative species & hybrids of the meadow subgenus

Hieracium, subgenus Pilosella hawkweeds: All nonnative species & hybrids of the wall subgenus

Hieracium, subgenus Hieracium herb-Robert Geranium robertianum hoary alyssum Berteroa incana houndstongue Cynoglossum officinale indigobush Amorpha fruticosa knapweed, black Centaurea nigra knapweed, brown Centaurea jacea knapweed, diffuse Centaurea diffusa knapweed, meadow Centaurea × gerstlaueri knapweed, Russian Rhaponticum repens knapweed, spotted Centaurea stoebe knotweed, Bohemian Fallopia × bohemica knotweed, giant Fallopia sachalinensis knotweed, Himalayan Persicaria wallichii knotweed, Japanese Fallopia japonica kochia Bassia scoparia lesser celandine Ficaria verna loosestrife, garden Lysimachia vulgaris loosestrife, purple Lythrum salicaria loosestrife, wand Lythrum virgatum Malta starthistle Centaurea melitensis parrotfeather Myriophyllum aquaticum perennial pepperweed Lepidium latifolium poison hemlock Conium maculatum policeman’s helmet Impatiens glandulifera puncturevine Tribulus terrestris Ravenna grass Tripidium ravennae rough chervil Chaerophyllum temulum rush skeletonweed Chondrilla juncea saltcedar Tamarix ramosissima Scotch broom Cytisus scoparius shiny geranium Geranium lucidum spurge flax Thymelaea passerina spurge laurel Daphne laureola spurge, leafy Euphorbia virgata spurge, myrtle Euphorbia myrsinites sulfur cinquefoil Potentilla recta tansy ragwort Jacobaea vulgaris thistle, musk Carduus nutans thistle, plumeless Carduus acanthoides thistle, Scotch Onopordum acanthium velvetleaf Abutilon theophrasti water primrose Ludwigia hexapetala white bryony Bryonia alba wild basil Clinopodium vulgare wild chervil Anthriscus sylvestris yellow archangel Lamiastrum galeobdolon yellow floating heart Nymphoides peltata yellow nutsedge Cyperus esculentus yellow starthistle Centaurea solstitialis

Class C Weeds absinth wormwood Artemisia absinthium Austrian fieldcress Rorippa austriaca babysbreath Gypsophila paniculata beach grasses, European, American, and hybrid

Ammophila arenaria, A.

breviligulata, and A.

arenaria x A. breviligulata black henbane Hyoscyamus niger blackgrass Alopecurus myosuroides buffalobur Solanum rostratum cereal rye Secale cereale common barberry Berberis vulgaris common catsear Hypochaeris radicata common groundsel Senecio vulgaris common St. Johnswort Hypericum perforatum common teasel Dipsacus fullonum curlyleaf pondweed Potamogeton crispus English hawthorn Crataegus monogyna English ivy - four cultivars only

Hedera helix ‘Baltica’, ‘Pittsburgh’, and ‘Star’, and H. hibernica ‘Hibernica’

Eurasian watermilfoil hybrid

Myriophyllum spicatum x Myriophyllum sibiricum evergreen blackberry Rubus laciniatus field bindweed Convolvulus arvensis fragrant waterlily Nymphaea odorata green alkanet Pentaglottis sempervirens hairy whitetop Lepidium appelianum Himalayan blackberry Rubus bifrons (Rubus armeniacus) hoary cress Lepidium draba Italian arum Arum italicum Japanese eelgrass Nanozostera japonica jubata grass Cortaderia jubata jointed goatgrass Aegilops cylindrica lawnweed Soliva sessilis longspine sandbur Cenchrus longispinus medusahead Taeniatherum caput-medusae nonnative cattail species & hybrids (reminder, does not include the native common cattail, Typha latifolia)

Typha species old man's beard Clematis vitalba oxeye daisy Leucanthemum vulgare Pampas grass Cortaderia selloana perennial sowthistle Sonchus arvensis reed canarygrass Phalaris arundinacea Russian olive Elaeagnus angustifolia scentless mayweed Tripleurospermum inodorum smoothseed alfalfa dodder Cuscuta approximata spikeweed Centromadia pungens spiny cocklebur Xanthium spinosum spotted jewelweed Impatiens capensis Swainsonpea Sphaerophysa salsula thistle, bull Cirsium vulgare thistle, Canada Cirsium arvense tree-of-heaven Ailanthus altissima ventenata Ventenata dubia white cockle Silene latifolia wild carrot (except where commercially grown)

Daucus carota yellow flag iris Iris pseudacorus yellow toadflax Linaria vulgaris

To learn more about noxious weeds and noxious weed control in Washington State, please contact:

WA State Noxious Weed Control Board P.O. Box 42560

Olympia, WA 98504-2560

(360) 725-5764

Email: noxiousweeds@agr.wa.gov Website: http://www.nwcb.wa.gov

Or WA State Department of Agriculture

(509) 249-6973 Or

Your County Noxious Weed Control Board

Washington State Noxious Weed List

Palmer amaranth, Amaranthus palmeri, is a weed that can cause a huge negative impact on agriculture.

Photo by Howard F. Schwartz, Colorado State University, bugwood.org

List arranged alphabetically by:

COMMON NAME