Class A Noxious Weeds are non-native species whose distribution in Washington State is still limited.
Please contact your County Weed Board for more information.
Bighead Knapweed
Centaurea macrocephala
Clary Sage
Salvia sclarea
Common Cordgrass
Spartina anglica
Common Crupina
Crupina vulgaris
Dense-Flowered Cordgrass
Spartina densiflora
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
Italian Thistle
Carduus pycnocephalus
Johnsongrass
Sorghum halepense
Kudzu
Pueraria montana var. lobata
Marsh Thistle
Cirsium palustre
Meadow Clary
Salvia pratensis
Mediterranean Sage
Salvia aethiopis
Milk Thistle
Silybum marianum
Oriental Clematis
Clematis orientalis
Palmer Amaranth
Amaranthus palmeri
Purple Starthistle
Centaurea calcitrapa
Reed Sweetgrass
Glyceria maxima
Ricefield Bulrush
Schoenoplectus mucronatus
Round Leaf Bittersweet
Celastrus orbiculatus
Salt Meadow Cordgrass
Spartina patens
Silverleaf Nightshade
Solanum elaeagnifolium
Slenderflower Thistle
Carduus tenuiflorus
Small-flowered Jewelweed
Impatiens parviflora
Smooth Cordgrass
Spartina alterniflora
South American spongeplant
Limnobium laevigatum
Spanish Broom
Spartium junceum
Syrian Bean-Caper
Zygophyllum fabago
Texas Blueweed
Helianthus ciliaris
Turkish thistle
Carduus cinereus
Variable-Leaf Milfoil, and Hybrid variable-leaf milfoil
Myriophyllum heterophyllum, Myriophyllum heterophyllum x Myriophyllum hippuroides
Vochin Knapweed
Centaurea nigrescens
Wild Four O'Clock
Mirabilis nyctaginea