Snohomish County
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Class A Weeds
Class A noxious weeds are those noxious weeds not native to the state that are of limited distribution orare unrecorded in the state and that pose a serious threat to the state. These weeds are a threat to allcounties of the state and eradication is required.
Bean-caper, Syrian / Zygophyllumfabago
Blueweed, Texas / Helianthus ciliaris
Broom, French / Genistamonspessulana
Broom, Spanish / Spartiumjunceum
Buffalobur / Solanum rostratum
Clary, meadow / Salvia pratensis
Clematis, oriental / Clematis orientalis
Cordgrass, smooth / Spartinaalterniflora
Cordgrass, common / Spartinaanglica
Cordgrass, salt meadow / Spartina patens
Cordgrass, denseflower / Spartinadensiflora
Crupina, common / Crupina vulgaris
False brome / Brachypodiumsylvaticum
Flax, spurge / Thymelaeapasserina
Floating primrose-willow / Ludwigiapeploides
Flowering rush / Butomusunbellatus
Four o' clock, wild / Mirabilis nyctaginea
Hogweed, giant / Heracleummantegazzianum
Hydrilla / Hydrillaverticillata
Johnsongrass / Sorghum halepense
Knapweed, bighead / Centaureamacrocephala
Knapweed, Vochin / Centaureanigrescens
Kudzu / Puerariamontana var. lobata
Mustard, garlic / Alliariapetiolata
Nightshade, silverleaf / Solanum elaeagnifolium
Goatsrue / Galega officinalis
Reed sweatgrass / Gyceria maxima
Ravenna grass / Saccharumravennae
Ricefield bulrush / Schoenoplectusmucronatus
Sage, clary / Salvia sclarea
Sage, Mediterranean / Salvia aethiopis
Spurge, eggleaf / Euphorbia oblongata
Starthistle, purple / Centaureacalcitrapa
Thistle, Italian / Carduuspycnocephalus
Thistle, milk / Silybummarianum
Thistle, slenderflower / Carduustenuiflorus
Variable-leaf milfoil / Myriophyllumheterophyllum
Woad, dyers / Isatistinctoria
Class B Weeds Designated
Class B designated weeds are common in the county and are not designated by the State Weed Boardto be controlled in that county, however the County has chosen to control these weeds and have includedthem on the County Weed List. Control in Snohomish County is required.
Knotweed, bohemian / Polygonum x bohemicum
Knotweed, giant / Polygonumsachalinense
Knotweed, Japanese / Polygonumcuspidatum
Loosestrife, purple / Lythrumsalicaria
Ragwort, tansy / Seneciojacobaea (view brochure)
Watermilfoil, Eurasian / Myriophyllum spicatum
Class B Weeds
Class B noxious weeds are those noxious weeds not native to the state that are of limited distribution or are unrecorded in a region of the state and that pose a serious threat to that region. Control is required ofthe following weeds in Snohomish County.
alyssum, hoary / Berteroaincana
blueweed / Echium vulgare
bryony, white / Bryonia alba
bugloss, annual / Anchusaarvensis
bugloss, common / Anchusa officinalis
camelthorn / Alhagimaurorum
chervil, wild / Anthriscussylvestris
cinquefoil, sulfur / Potentilla recta
common reed / Phragmitesaustralis
fanwort / Cabombacaroliniana
fennel, common / Foeniculum vulgare
floating heart, yellow / Nymphoidespeltata
gorse / Ulexeuropaeus
hairy willow-herb / Epilobiumhirsutum
Hawkweeds: / nonnative species and hybrids of the Meadow subgenus (Piosella)
Hawkweeds: / nonnative species and hybrids of Wall subgenus (Hiercaium)
Himalayan knotweed / Polygonumpolystachyum
houndstongue / Cynoglossumofficinale
indigobush / Amorphafruticosa
knapweed, black / Centaureanigra
knapweed, brown / Centaureajacea
knapweed, diffuse / Centaureadiffusa
knapweed, meadow / Centaureajacea x nigra
knapweed, Russian / Acroptilonrepens
knapweed, spotted / Centaureabiebersteinii
kochia / Kochia scoparia
lesser celandine / Ficaraverna
loosestrife, garden / Lysimachia vulgaris
nutsedge, yellow / Cyperusesculentus
parrotfeather / Myriophyllumaquaticum
pepperweed, perennial / Lepidiumlatifolium
poison hemlock / Conium maculatum
policeman's helmet / impatiens glandulifera
puncturevine / Tribulusterrestris
saltcedar / Tamarixramosissima
sandbur, longspine / Cenchruslongispinus
shiny geranium / Geranium lucidum
skeletonweed, rush / Chondrillajuncea
spurge, laurel / Daphne laureola
spurge, leafy / Euphorbia esula
splurge, myrtle / Euphorbia myrsinites
starthistle, yellow / Centaureasolstitialis
thistle, musk / Carduusnutans
thistle, plumeless / Carduusacanthoides
thistle, Scotch / Onopordumacanthium
toadflax, Dalmation / Linariadalmatica ssp. dalmatica
velvetleaf / Abutilon theophrasti
water primrose / Ludwigiahexapetala
Class C Weeds
Class C noxious weeds are designated by the State Weed Board as noxious so any county within thestate may control these weeds within the county if they desire. Snohomish County has chosen to controlthe following list of Class C noxious weeds. Control in Snohomish County is required.
(Except not listed as Class A or B, nativespecies designated in WAC 16-750-015)
English hawthorn / Crataegusmonogyma