Class B Noxious Weeds

Class B noxious weeds are non-native 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 uninfested regions.
Please contact your County Weed Board to learn which species are designated in your area, or go here to see a map of Regions with links to the Class B Designates for each Region.


Austrian fieldcress, Rorripa austriaca	blackgrass Alopecurus myosuroides	blueweed Echium vulgare	Brazilian elodea Egeria densa	bugloss, annual Anchusa arvensis

bugloss, common Anchusa officinalis	camelthorn Alhagi maurorum	common catsear Hypochaeris radicata	common fennel Foeniculum vulgare	cordgrass, common Spartina anglica

cordgrass, smooth Spartina alterniflora	Dalmatian toadflax Linaria dalmatica ssp. dalmatica	Eurasian watermilfoil Myriophyllum spicatum	fanwort Cabomba caroliniana	gorse Ulex europaeus

grass-leaved arrowhead Sagittaria graminea	hawkweed oxtongue Picris hieracioides	hawkweed, mouseear Hieracium pilosella	hawkweed, orange Hieracium aurantiacum	hawkweed, polar Hieracium atratum

hawkweed, queen-devil Hieracium glomeratum	hawkweed, smooth Hieracium laevigatum	hawkweed, yellow Hieracium caespitosum	New!hedgeparsley Torilis arvensis	herb-Robert Geranium robertianum

alyssum, hoary Berteroa incana	houndstongue Cynoglossum officinale	indigobush Amorpha fruticosa	knapweed, black Centaurea nigra	knapweed, brown Centaurea jacea

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knapweed, diffuse Centaurea diffusa	knapweed, meadow Centaurea jacea x nigra	knapweed, Russian Acroptilon repens	knapweed, spotted Centaurea biebersteinii	knotweed, Bohemian Polygonum bohemicum

knotweed, giant Polygonum sachalinense	knotweed, Himalayan Polygonum polystachyum	knotweed, Japanese Polygonum cuspidatum	kochia Kochia scoparia	lepyrodiclis Lepyrodiclis holosteoides
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sandbur, longspine Cenchrus longispinus	loosestrife, garden Lysimachia vulgaris	loosestrife, purple Lythrum salicaria	loosestrife, wand Lythrum virgatum	daisy, oxeye Leucanthemum vulgare

parrotfeather Myriophyllum aquaticum	pepperweed, perennial Lepidium latifolium	sowthistle, perennial Sonchus arvensis ssp. arvensis	helmet, policeman's Impatiens gladulifera	puncturevine Tribulus terrestris

skeletonweed, rush Chondrilla juncea	saltcedar Tamarix ramosissima	broom, Scotch Cytisus scoparius	spurge laurel Daphne laureola	spurge, leafy Euphorbia esula


spurge, myrtle Euphorbia myrsinites	cinquefoil, sulfur Potentilla recta	swainsonpea Sphaerophysa salsula	ragwort, tansy Senecio jacobaea	thistle, musk Carduus nutans

thistle, plumeless Carduus acanthoides	thistle, Scotch Onopordum acanthium	primrose, water Ludwigia hexapetala	bryony, white Bryonia alba	chervil, wild Anthriscus sylvestri

carrot, wild Daucus carota	nutsedge, yellow Cyperus esculentus	starthistle, yellow Centaurea solstitialis	floating heart, yellow Nymphoides peltata