Class C Noxious Weeds

Class C noxious weeds are either already widespread in Washington or are of special interest to the agricultural industry.

The Class C status allows a county to enforce control if it beneficial to that county (for example, to protect crops).
Other counties may choose to provide education or technical support for the removal or control of these weeds.

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archangel, yellow Lamiastrum galeobdolon	babysbreath Gypsophila paniculata	beard, old man's Clematis vitalba	bindweed, field Convolvulus arvensis	canarygrass, reed Phalaris arundinacea
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cockle, white Silene latifolia ssp. alba	cocklebur, spiny Xanthium spinosum	cress, hoary Cardaria draba	dodder, smoothseed alfalfa Cuscata approximata	goatgrass, jointed Aegilops cylindrica
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groundsel, common Senecio vulgaris	NEW 2008! hawkweed, common Hieracium lachenalli	hawkweeds, nonnative and invasive species not listed elsewhere	henbane, black Hyocyamus niger	iris, yellow flag Iris pseudacorus

ivy, English (Hedera spp., 4 cultivars only)	mayweed, scentless Matricaria perforata	poison-hemlock Conium maculatum	pondweed, curly-leaf Potamogeton crispus	rye, cereal Secale cereale
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spikeweed Hemizonia pungens	St. Johnswort, common Hypericum perforatum	tansy, common Tanacetum vulgare	thistle, bull Cirsium vulgare	thistle, Canada Cirsium arvense

toadflax, yellow Linaria vulgaris	water lily, fragrant Nymphaea odorata	whitetop, hairy Cardaria pubescens	willow-herb, hairy Epilobium hirsutum	wormwood, absinth Artemisia absinthium

Washington State Noxious Weed Control Board

Class C noxious weeds are either already widespread in Washington or are of special interest to the agricultural industry.

The Class C status allows a county to enforce control if it beneficial to that county (for example, to protect crops).
Other counties may choose to provide education or technical support for the removal or control of these weeds.


babysbreath Gypsophila paniculata	beard, old man's Clematis vitalba	bindweed, field Convolvulus arvensis	NEW! butterfly bush Buddleja davidii	canarygrass, reed Phalaris arundinacea

cockle, white Silene latifolia ssp. alba	cress, hoary Cardaria draba	dodder, smoothseed alfalfa Cuscuta approximata	goatgrass, jointed Aegilops cylindrica	groundsel, common Senecio vulgaris

hawkweeds, nonnative and invasive species not listed elsewhere	henbane, black Hyocyamus niger	iris, yellow flag Iris pseudacorus	ivy, English (Hedera spp., 4 cultivars only)	mayweed, scentless Matricaria perforata
				Image unavailable at this time
poison-hemlock Conium maculatum	pondweed, curly-leaf Potamogeton crispus	reed, common Phragmites australis	rye, cereal Secale cereale	spikeweed Hemizonia pungens

St. Johnswort, common Hypericum perforatum	tansy, common Tanacetum vulgare	thistle, bull Cirsium vulgare	thistle, Canada Cirsium arvense	toadflax, yellow Linaria vulgaris

water lily, fragrant Nymphaea odorata	whitetop, hairy Cardaria pubescens	willow-herb, hairy Epilobium hirsutum	wormwood, absinth Artemisia absinthium