Class C noxious weeds are either already widespread in Washington or are of special interest to the agricultural industry.
Please contact your county weed board to find out more information.
Absinth Wormwood
Artemisia absinthium
Austrian Fieldcress
Rorippa austriaca
Baby's Breath
Gypsophila paniculata
Beach grass, American, European, and hybrid
Ammophila breviligulata, A. arenaria, A. breviligulata x A. arenaria
Black Henbane
Hyoscyamus niger
Blackgrass
Alopecurus myosuroides
Buffalobur
Solanum rostratum
Bull Thistle
Cirsium vulgare
Canada Thistle
Cirsium arvense
Cereal Rye
Secale cereale
Common Barberry
Berberis vulgaris
Common Catsear
Hypochaeris radicata
Common Groundsel
Senecio vulgaris
Common St. Johnswort
Hypericum perforatum
Common Teasel
Dipsacus fullonum
Curlyleaf Pondweed
Potamogeton crispus
English Hawthorn
Crataegus monogyna
English Ivy
Hedera helix 'Baltica', 'Pittsburgh', and 'Star'; Hedera hibernica 'Hibernica'
Eurasian watermilfoil hybrid
Myriophyllum spicatum x Myriophyllum sibiricum
Evergreen Blackberry
Rubus laciniatus
Field Bindweed
Convolvulus arvensis
Fragrant Waterlily
Nymphaea odorata
Green Alkanet
Pentaglottis sempervirens
Hairy Whitetop
Lepidium appelianum
Himalayan Blackberry
Rubus armeniacus
Hoary Cress
Lepidium draba
Italian Arum
Arum italicum
Japanese Eelgrass
Nanozostera japonica
Jointed Goatgrass
Aegilops cylindrica
Jubata Grass
Cortaderia jubata
Lawnweed
Soliva sessilis
Lepyrodiclis
Lepyrodiclis holosteoides
Longspine Sandbur
Cenchrus longispinus
Medusahead
Taeniatherum caput-medusae
Nonnative Cattails
Typha species
Old Man's Beard
Clematis vitalba
Oxeye Daisy
Leucanthemum vulgare
Pampas Grass
Cortaderia selloana
Perennial Sowthistle
Sonchus arvensis ssp. arvensis
Reed Canarygrass
Phalaris arundinacea
Russian Olive
Elaeagnus angustifolia
Scentless Mayweed
Matricaria perforata
Smoothseed Alfalfa Dodder
Cuscuta approximata
Spikeweed
Centromadia pungens
Spiny Cocklebur
Xanthium spinosum
Spotted Jewelweed
Impatiens capensis
Swainsonpea
Sphaerophysa salsula
Tree-of-Heaven
Ailanthus altissima
Ventenata
Ventenata dubia
White Cockle
Silene latifolia ssp. alba
Wild Carrot
Daucus carota
Yellow Flag Iris
Iris pseudacorus
Yellow Toadflax
Linaria vulgaris