Jefferson County Noxious Weed Control Board
2018 Proposed Weed List
WAC 16-750-005 State noxious weed list—Class A noxious weeds
Common Name Scientific Name
broom, French Genista monspessulana broom, Spanish Spartium junceum common crupina Crupina vulgaris cordgrass, common Spartina anglica cordgrass, dense-flowered Spartina densiflora cordgrass, salt meadow 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 garlic mustard Alliaria petiolata giant hogweed Heracleum mantegazzianum goatsrue Galega officinalis hydrilla Hydrilla verticillata jewelweed, small-flowered Impatiens parviflora Johnsongrass Sorghum halepense knapweed, bighead Centaurea macrocephala knapweed, Vochin Centaurea nigrescens kudzu Pueraria montana var. lobate meadow clary Salvia pratensis oriental clematis Clematis orientalis purple starthistle Centaurea calcitrapa reed sweetgrass Glyceria maxima ricefield bulrush Schoenoplectus mucronatus sage, clary Salvia sclarea sage, Mediterranean Salvia aethiopis silverleaf nightshade Solanum elaeagnifolium 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 wild four o'clock Mirabilis nyctaginea
WAC 16-750-005 State noxious weed list: Region 1 Class B designate noxious weeds
Common Name Scientific Name
Blueweed Echium vulgare Brazilian elodea Egeria densa bugloss, annual Anchusa arvensis bugloss, common Anchusa officinalis camelthorn Alhagi maurorum common reed Phragmites australis (nonnative genotypes only) 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 willow-herb Epilobium hirsutum hawkweed oxtongue Picris hieracioides hawkweed, orange Hieracium aurantiacum hawkweeds All nonnative species: and hybrids of the Meadow subgenus (Pilosella), including, but not limited to, mouseear (Hieraciumpilosella), pale (H. lactucella), queen-devil (H. glomeratum), tall (H. piloselloides), whiplash (H. flagellare), yellow (H. caespitosum), and yellow-devil (H. x floribundum) hawkweeds All nonnative species and hybrids of the Wall subgenus (Hieracium), including, but not limited to, common (Hieracium lachenalii), European (H. sabaudum), polar (H. atratum), smooth (H. laevigatum), spotted (H. maculatum), and wall (H. murorum) 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 x moncktonii knapweed, Russian Acroptilon repens knapweed, spotted Centaurea stoebe knotweed, Himalayan Polygonum polystachyum kochia Kochia scoparia loosestrife, garden Lysimachia vulgaris Malta starthistle Centaurea melitensis parrotfeather Myriophyllum aquaticum perennial pepperweed Lepidium latifolium policeman's helmet Impatiens glandulifera puncturevine Tribulus terrestris
rush skeletonweed Chondrilla juncea saltcedar Tamarix ramosissima (unless intentionally planted prior to 2004) shiny geranium Geranium lucidum spurge, leafy Euphorbia esula 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 chervil Anthriscus sylvestris yellow floating heart Nymphoides peltata yellow nutsedge Cyperus esculentus yellow starthistle Centaurea solstitialis
County selected weeds
RCW 17.10.090 State Noxious Weed List allows counties to select weeds from the B or the C list for mandatory control within the county.
Common Name Scientific Name archangel, yellow (B) Lamiastrum galeobdolon broom, Scotch (C) Cytisus scoparius bush, butterfly (B) Buddleja davidii (except in incorporated Port Townsend) canarygrass, reed (C) Phalaris arundinacea fennel, common (B) Foeniculum vulgare (except in incorporated Port Townsend) knotweeds(B) Polygonum spp.(non-native) poison hemlock (B) Conium maculatum ragwort, tansy (B) Senecio jacobaea Ravenna grass (B) Saccharum ravennae sowthistle, perennial (C) Sonchus arvensis ssp. spotted jewelweed Impatiens capensis Teasel, common (C) Dipsacus fullonum Eurasian watermilfoil hybrid (C) Myriophyllum spicatum x M. sibiricum
Weeds of concern These weeds are not required for control in Jefferson County, but monitoring and control are encouraged.
Common Name Scientific Name
bindweed, field (C) Convolvulus arvensis blackberry, Himalayan (C) Rubus armeniacus blackberry, evergreen (C) Rubus laciniatus buffalobur (C) Solanum rostratum carrot, wild (C) Daucus carota catsear, common (C) Hypochaeris radicata daisy, oxeye (C) Leucanthemum vulgare groundsel, common (C) Senecio vulgaris herb Robert (B) Geranium robertianum Italian arum (C ) Arum italicum ivy, English (C) Hedera helix “Baltica”, “Pittsburgh”, “Star”, and H. hibernica “Hibernica” Japanese eelgrass (C) Zostera japonica laurel, spurge (B) Daphne laureola non-native cattail species Typha spp and hybrids (C) old man’s beard (C) Clematis vitalba pampas & jubata grass Corderia selloana & jubata spurge, myrtle (B) Euphorbia myrsinites St Johnswort, common (C) Hypericum perforatum tansy, common (C) Tanacetum vulgare thistle, bull (C) Cirsium vulgare thistle, Canada (C) Cirsium arvense tree-of-heaven (C) Ailanthus altissima toadflax, yellow (C) Linaria vulgaris yellow flag iris (C) Iris pseudacorus