Skagit County Noxious Weed List
Download the Weed List.
It's the duty of every
owner of land to control and prevent the spread of noxious weeds within
and from the owner's property. (RCW 17.10.140)
Class A Noxious Weed Images
Class B Noxious Weed Images
Class C Noxious Weed Images
Skagit County Noxious Weed Image Index
Poison Hemlock in Skagit County - power point presentation (July 5, 2022)
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:
Class B noxious weeds are nonnative species whose distribution is limited to portions of Washington State.
- Species are designated for control in state regions where they are not yet widespread. Prevention of new infestations in these areas is the primary goal.
- In regions where a Class B species is already abundant, control is decided at the local level. Containment of these weeds is the primary goal so that they do not spread into un-infested re-gions.
- The Washington State Noxious Weed Board or a County Noxious Weed Board can designate a Class B noxious weed for mandatory control.
Class B designations at the state level are listed in WAC 16-750-011 and are based on our designation region map.
Class C Weeds:
Class C noxious weeds are either already widespread in Washington or are of special interest to the agricul-tural industry.
- The Class C status allows a county to enforce control if it is beneficial to that county (for exam-ple: to protect crops).
Other counties may choose to provide education or technical support for the removal or control of these weeds.
Download the Weed List
| Class A Weeds where 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 |
| marsh thistle |
Cirsium palustre |
| meadow clary |
Salvia pratensis |
| oriental clematis |
Clematis orientalis |
| palmer amaranth |
ameranthus palmeri |
| purple starthistle |
Centaurea calcitrapa |
| reed sweetgrass |
Glyceria maxima |
| ricefield bulrush |
Schoenoplectus mucronatus |
| round leaf bittersweet |
Celastrus orbiculatus |
| 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 hybrids |
Myriophyllum heterophyllum |
| wild four-o'clock |
Mirabilis nyctaginea |
| Class B Designate Selected Weeds (Required) |
| The following are B-Designates and ARE required for control |
| blueweed |
Echium vulgare |
| Brazilian elodea |
Egeria densa |
| bugloss, annual |
Lycopsis arvensis |
| bugloss, common |
Anchusa officinalis |
| camelthorn |
Alhagi maurorum |
| common reed (nonnative genotypes only) |
Phragmites australis |
| Dalmatian toadflax |
Linaria dalmatica ssp. dalmatica |
| 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 |
| 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, giant |
Fallopia sachalinensis |
| knotweed, Himalayan |
Persicaria wallichii |
| kochia |
Bassia scoparia |
| loosestrife, garden |
Lysimachia vulgaris |
| Malta starthistle |
Centaurea melitensis |
| parrotfeather |
Myriophyllum aquaticum |
| perennial pepperweed |
Lepidium latifolium |
| policeman’s helmet |
Impatiens glandulifera |
| puncturevine |
Tribulus terrestris |
| rough chervil |
Chaerophyllum temulum |
| rush skeletonweed |
Chondrilla juncea |
| saltcedar |
Tamarix ramosissima |
| shiny geranium |
Geranium lucidum |
| spurge laurel |
Daphne laureola |
| spurge, leafy |
Euphorbia virgata |
| spurge, myrtle |
Euphorbia myrsinites |
| sulfur cinquefoil |
Potentilla recta |
| 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 starthistle |
Centaurea solstitialis |
| Class B Non-Designate Weeds (Optional) |
| The following are B Non-Designates and are NOT required for control |
| common fennel, (except bulbing fennel) |
Foeniculum vulgare except F. vulgare var. azoricum) |
| common tansy |
Tanacetum vulgare |
| Eurasian watermilfoil |
Myriophyllum spicatum |
| hawkweeds: All nonnative species & hybrids of the wall subgenus |
Hieracium, subgenus Hieracium |
| herb-Robert |
Geranium robertianum |
| lesser celandine |
Ficaria verna |
| loosestrife, purple |
Lythrum salicaria |
| loosestrife, wand |
Lythrum virgatum |
| Ravenna grass |
Tripidium ravennae |
| spurge flax |
Thymelaea passerina |
| butterfly bush |
Buddleja davidii |
| yellow nutsedge |
Cyperus esculentus |
| Class B Non-Designate Weeds (Required) |
| The following are B Non-Designates selected for control by the Skagit County Noxious Weed Control Board and ARE required for control |
| knotweed, Bohemian |
Fallopia × bohemica |
| knotweed, Japanese |
Fallopia japonica |
| poison hemlock |
Conium maculatum |
| Scotch broom |
Cytisus scoparius |
| tansy ragwort |
Jacobaea vulgaris |
| Class C Weeds (Required) |
| The following are Class C Noxious Weeds selected for control by the Skagit County Noxious Weed Control Board and ARE required for control |
| common teasel |
Dipsacus fullonum |
| Italian arum |
Arum italicum |
| thistle, bull |
Cirsium vulgare |
| thistle, Canada |
Cirsium arvense |
| Class C Weeds (Optional ) |
| These are optional Class C noxious and are NOT required for control |
| absinth wormwood |
Artemisia absinthium |
| Austrian fieldcress |
Rorippa austriaca |
| babysbreath |
Gypsophila paniculata |
| Beach grass, European, American, and hybrids |
Ammophila arenaria, A. breviligulata, and A. arenaria x 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 |
| 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 |
| 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 |
| 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 Skagit County, please contact:
Skagit County
Noxious Weed Control Board
1800 Continental Place
Mount Vernon, WA
98273-5625
Evan Emrick
Noxious Weed Coordinator- Safety Committee Representative- PW
Skagit County Public Works | 1800 Continental PL | Mount Vernon WA 98273
(360) 707-1502
evane@co.skagit.wa.us
Or
Washington State
Noxious Weed Control Board
P.O. Box 42560
Olympia, WA 98504
(360) 725-5764
Or
Washington State
Department of Agriculture
21 North First Avenue #103
Yakima, WA 98902
(509) 249-6973
Please help protect Skagit’s economy and environment from noxious weeds! |
