Class A Weeds: Non-native species whose distribution knapweed, Vochin Centaurea nigrescens herb-Robert Geranium robertianum blackgrass Alopecurus myosuroides in Washington is still limited. Preventing new infestations kudzu Pueraria montana var. lobata hoary alyssum Berteroa incana buffalobur Solanum rostratum and eradicating existing infestations are the highest priority. meadow clary Salvia pratensis houndstongue Cynoglossum officinale cereal rye Secale cereale Eradication of all Class A plants is required by law. oriental clematis Clematis orientalis indigobush Amorpha fruticosa common barberry Berberis vulgaris purple starthistle Centaurea calcitrapa knapweed, black Centaurea nigra common catsear Hypochaeris radicata Class B Weeds: Non-native species presently limited reed sweetgrass Glyceria maxima knapweed, brown Centaurea jacea common groundsel Senecio vulgaris to portions of the State. Species are designated for control ricefield bulrush Schoenoplectus mucronatus knapweed, diffuse Centaurea diffusa common St. Johnswort Hypericum perforatum in regions where they are not yet widespread. Preventing sage, clary Salvia sclarea knapweed, meadow Centaurea x moncktonii common tansy Tanacetum vulgare new infestations in these areas is a high priority. In regions sage, Mediterranean Salvia aethiopis knapweed, Russian Acroptilon repens common teasel Dipsacus fullonum where a Class B species is already abundant, control is Ravenna grass Saccharum ravennae knapweed, spotted Centaurea stoebe curlyleaf pondweed Potamogeton crispus decided at the local level, with containment as the primary silverleaf nightshade Solanum elaeagnifolium knotweed, Bohemian Polygonum x bohemicum English hawthorn Crataegus monogyna goal. Spanish broom Spartium junceum knotweed, giant Polygonum sachalinense English ivy - four cultivars Hedera helix Butterfly bush, Buddleja dacidii, is designated for spurge flax Thymelaea passerina knotweed, Himalayan Polygonum only control where located within 100 feet of a natural Syrian beancaper Zygophyllum fabago polystachyum evergreen blackberry Rubus laciniatus watercourse. Texas blueweed Helianthus ciliaris knotweed, Japanese Polygonum cuspidatum field bindweed Convolvulus arvensis thistle, Italian Carduus pycnocephalus kochia Kochia scoparia fragrant waterlily Nymphaea odorata Shiny Geranium, Geranium lucidum, is designated for thistle, milk Silybum marianum lesser celandine Ficaria verna hairy whitetop Lepidium appelianum control at select locations as designated by the thistle, slenderflower Carduus tenuiflorus loosestrife, garden Lysimachia vulgaris Himalayan blackberry Rubus armeniacus Noxious Weed Control Board. variable-leaf milfoil Myriophyllum heterophyllum loosestrife, purple Lythrum salicaria hoary cress Lepidium draba wild four-o'clock Mirabilis nyctaginea loosestrife, wand Lythrum virgatum Italian arum Arum italicum parrotfeather Myriophyllum aquaticum Japanese eelgrass Zostera japonica Class C Weeds: Noxious weeds that are typically Class B Weeds perennial pepperweed Lepidium latifolium jubata grass Cortaderia jubata widespread in WA or are of special interest to the state’s blueweed Echium vulgare poison hemlock Conium maculatum jointed goatgrass Aegilops cylindrica agricultural industry. The Class C status allows counties to Brazilian elodea Egeria densa policeman’s helmet Impatiens glandulifera lawnweed Soliva sessilis require control if locally desired. bugloss, annual Anchusa arvensis puncturevine Tribulus terrestris longspine sandbur Cenchrus longispinus Species in bold are designated for control in bugloss, common Anchusa officinalis rush skeletonweed Chondrilla juncea medusahead Taeniatherum caput- Clark County, Other counties may choose to provide butterfly bush Buddleja davidii saltcedar Tamarix ramosissima medusae education or technical consultation. camelthorn Alhagi maurorum Scotch broom Cytisus scoparius nonnative cattail species Typha spp. common fennel, (except Foeniculum vulgare except shiny geranium Geranium lucidum and hybrids Class A Weeds bulbing fennel) F. vulgare var. azoricum) spurge laurel Daphne laureola old man's beard Clematis vitalba Eradication is required common reed Phragmites australis spurge, leafy Euphorbia esula oxeye daisy Leucanthemum vulgare common crupina Crupina vulgaris (nonnative genotypes spurge, myrtle Euphorbia myrsinites Pampas grass Cortaderia selloana cordgrass, common Spartina anglica only) sulfur cinquefoil Potentilla recta perennial sowthistle Sonchus arvensis cordgrass, dense- Spartina densiflora Dalmatian toadflax Linaria dalmatica ssp. tansy ragwort Senecio jacobaea reed canarygrass Phalaris arundinacea flowered dalmatica thistle, musk Carduus nutans Russian olive Elaeagnus angustifolia cordgrass, Spartina patens Eurasian watermilfoil Myriophyllum spicatum thistle, plumeless Carduus acanthoides scentless mayweed Matricaria perforata saltmeadow fanwort Cabomba caroliniana thistle, Scotch Onopordum acanthium smoothseed alfalfa Cuscuta approximata cordgrass, smooth Spartina alterniflora gorse Ulex europaeus velvetleaf Abutilon theophrasti dodder dyer’s woad Isatis tinctoria grass-leaved Sagittaria graminea water primrose Ludwigia hexapetala spikeweed Centromadia pungens eggleaf spurge Euphorbia oblongata arrowhead white bryony Bryonia alba spiny cocklebur Xanthium spinosum false brome Brachypodium sylvaticum hairy willowherb Epilobium hirsutum wild chervil Anthriscus sylvestris Swainsonpea Sphaerophysa salsula floating primrose- Ludwigia peploides hawkweed, oxtongue Picris hieracioides yellow archangel Lamiastrum galeobdolon willow hawkweed, orange Hieracium aurantiacum yellow floatingheart Nymphoides peltata thistle, bull Cirsium vulgare flowering rush Butomus umbellatus hawkweeds: All Hieracium, subgenus yellow nutsedge Cyperus esculentus thistle, Canada Cirsium arvense French broom Genista monspessulana nonnative species and Pilosella and yellow starthistle Centaurea solstitialis tree-of-heaven Ailanthus altissima garlic mustard Alliaria petiolata ventenata Ventenata dubia hybrids of the meadow Hieracium giant hogweed Heracleum mantegazzianum Class C Weeds white cockle Silene latifolia ssp. alba goatsrue Galega officinalis hawkweeds: All Hieracium, subgenus absinth wormwood Artemisia absinthium wild carrot (except where Daucus carota hydrilla Hydrilla verticillata nonnative species and Hieracium Austrian fieldcress Rorippa austriaca commercially grown) Johnsongrass Sorghum halepense hybrids of the wall babysbreath Gypsophila paniculata yellowflag iris Iris pseudacorus black henbane Hyoscyamus niger knapweed, bighead Centaurea macrocephala subgenus yellow toadflax Linaria vulgaris Disposing of noxious weed material General Techniques: Controlling noxious weeds can generate small to If plants are flowering, cut and bag flowers when For more information on noxious 2016 large amounts of plant material. Properly possible to prevent seed development and weeds and noxious weed control in managing and handling this material, as well as dispersal. Seal bags and put them in the trash. Clark County, please contact: soil that may contain roots or seeds, will help Noxious weeds that are treated with herbicide may Clark County prevent the spread and reestablishment of these be left in place with some exceptions (see toxic, noxious weeds. Conduct as much noxious weed noxious weed information on previous page) Clark County control as possible before plants flower and Public Works Noxious Weed List develop seed. Also, by controlling noxious weeds Woody and Herbaceous Material: Vegetation Management earlier in the season, before they are finished Small amounts of woody plant material that do not growing, there will be less plant material to have seeds and do not spread vegetatively, can 1300 Franklin St. manage. be controlled by pulling or cutting plants & leaving Vancouver, WA 98660 Dry material of some toxic plants remains toxic for them on site with roots exposed to dry, making a (360)-397-6140 years. It is best to dispose of toxic, noxious weeds brush pile, shredding or burning. If seeds are to prevent accidental exposure and poisoning. present, leave on site and pile and cover with a Email: [email protected] Poisonous plants left on site could harm people as tarp or burn (if legal in your area) and monitor the Website: www.clark.wa.gov/weed well as animals that may feed on the dead plants. area for new plants. For all toxic, noxious weeds, wear protective clothing and eye protection to prevent accidental Bag and Trash: exposure. Do not compost or put in yard waste. For toxic plants and small infestations of noxious weeds, the entire plant can be removed sealed Examples of toxic, noxious weeds into a plastic trash bag & disposed. When possible, allow bagged plants to rot in a sunny Poison hemlock location, and then dispose in a regular trash bag. (Conium maculatum) – Remains toxic for several years after being pulled. Bag and remove entire plants. Giant hogweed (Heracleum mantegazzianum) Wear protective clothing and eyewear–do not Other Resources: touch plant parts as they contain a toxic sap. Carefully bag plants and dispose. Washington State Noxious Weed Control Board Tansy ragwort (Senecio jacobaea)–Dried plants are more P O Box 42560 palatable to animals so be sure to remove plant Olympia, WA 98504 material from pasture area. Toxicity of the plant (360) 902-1901 remains when it is dried and baled in hay. www.nwcb.wa.gov Houndstongue Or (Cynoglossum officinale)– Watch out for the seeds that readily stick to Washington State clothing and shoes. Plants