| Common Name | Scientific Name |
| absinth wormwood | Artemisia absinthium |
| Austrian fieldcress | Rorippa austriaca |
| babysbreath | Gypsophila paniculata |
| black henbane | Hyoscyamus niger |
| blackberry, evergreen | Rubus laciniatus |
| blackberry, Himalayan | Rubus armeniacus |
| blackgrass | Alopecurus myosuroides |
| cereal rye | Secale cereale |
| common barberry | Berberis vulgaris |
| common catsear | Hypochaeris radicata |
| common groundsel | Senecio vulgaris |
| common St. Johnswort | Hypericum perforatum |
| common tansy | Tanacetum vulgare |
| common teasel | Dipsacus fullonum |
| curly-leaf pondweed | Potamogeton crispus |
| English ivy 4 cultivars only: | Hedera hibernica 'Hibernica' |
| Hedera helix 'Baltica' |
| Hedera helix 'Pittsburgh' |
| Hedera helix 'Star' |
| field bindweed | Convolvulus arvensis |
| fragrant water lily | Nymphaea odorata |
| hairy whitetop | Cardaria pubescens |
| hawkweed, common | Hieracium lachenalii |
| hawkweed, polar | Hieracium atratum |
| hawkweed, other nonnative species | Hieracium spp., except species designated in the note in the left-hand column |
| Note: | |
| This listing includes all species of Hieracium, except the following: | |
| • Species designated as Class A noxious weeds in WAC 16-750-005; | |
| • Species designated as Class B noxious weeds in WAC 16-750-011; | |
| • Native species designated below: | |
| – Canada hawkweed (H. canadense) | |
| – houndstongue hawkweed (H. cynoglossoides) | |
| – long-beaked hawkweed (H. longiberbe) | |
| – narrow-leaved hawkweed (H. umbellatum) | |
| – slender hawkweed (H. gracile) | |
| – western hawkweed (H. albertinum) | |
| – white-flowered hawkweed (H. albiflorum) | |
| – woolley-weed (H. scouleri) | |
| hoary cress | Cardaria draba |
| Japanese eelgrass | Zostera japonica |
jointed goatgrass |
Aegilops cylindrica |
lawnweed |
Soliva sessilis |
lepyrodiclis |
Lepyrodiclis holosteoides |
| longspine sandbur | Cenchrus longispinus |
| old man's beard | Clematis vitalba |
| oxeye daisy | Leucanthemum vulgare |
| perennial sowthistle | Sonchus arvensis ssp. arvensis |
| reed canarygrass | Phalaris arundinacea |
| scentless mayweed | Matricaria perforata |
| smoothseed alfalfa dodder | Cuscuta approximata |
| spikeweed | Hemizonia pungens |
| spiny cocklebur | Xanthium spinosum |
| Swainsonpea | Sphaerophysa salsula |
| thistle, bull | Cirsium vulgare |
| thistle, Canada | Cirsium arvense |
| tree-of-heaven | Ailanthus altissima |
| white cockle | Silene latifolia ssp. alba |
| wild carrot (except where commercially grown) | Daucus carota |
| yellow flag iris | Iris pseudacorus |
| yellow toadflax | Linaria vulgaris |