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 of the following weeds in Snohomish County.

Common NameScientific Name
alyssum, hoaryBerteroa incana
blueweedEchium vulgare
bryony, whiteBryonia alba
bugloss, annualAnchusa arvensis
bugloss, commonAnchusa officinalis
camelthornAlhagi maurorum
chervil, wildAnthriscus sylvestris
cinquefoil, sulfurPotentilla recta
common reedPhragmites australis
fanwortCabomba caroliniana
fennel, commonFoeniculum vulgare
floating heart, yellowNymphoides peltata
gorse (PDF)Ulex europaeus
hairy willow-herbEpilobium hirsutum
Hawkweeds:nonnative species and hybrids of the Meadow subgenus (Piosella)
Hawkweeds:nonnative species and hybrids of Wall subgenus (Hiercaium)
Himalayan knotweedPolygonum polystachyum
houndstongueCynoglossum officinale
indigobushAmorpha fruticosa
knapweed, blackCentaurea nigra
knapweed, brownCentaurea jacea
knapweed, diffuseCentaurea diffusa
knapweed, meadowCentaurea jacea x nigra
knapweed, RussianAcroptilon repens
knapweed, spottedCentaurea biebersteinii
kochiaKochia scoparia
lesser celandineFicara verna
loosestrife, gardenLysimachia vulgaris
nutsedge, yellowCyperus esculentus
parrotfeatherMyriophyllum aquaticum
pepperweed, perennialLepidium latifolium
poison hemlock (PDF)Conium maculatum
policeman's helmet (PDF)impatiens glandulifera
puncturevineTribulus terrestris
saltcedarTamarix ramosissima
sandbur, longspineCenchrus longispinus
shiny geraniumGeranium lucidum
skeletonweed, rushChondrilla juncea
spurge, laurelDaphne laureola
spurge, leafyEuphorbia esula
splurge, myrtle (PDF)Euphorbia myrsinites
starthistle, yellowCentaurea solstitialis
thistle, muskCarduus nutans
thistle, plumelessCarduus acanthoides
thistle, ScotchOnopordum acanthium
toadflax, DalmationLinaria dalmatica ssp. dalmatica
velvetleafAbutilon theophrasti
water primroseLudwigia hexapetala