Class A Weeds: Non-native species whose meadow clary Salvia pratensis herb-Robert Geranium robertianum yellow floating heart Nymphoides peltata
distribution in Washington is still limited. purple starthistle Centaurea calcitrapa hoary alyssum Berteroa incana yellow nutsedge Cyperus esculentus
Preventing new infestations and eradicating reed sweetgrass Glyceria maxima houndstongue Cynoglossum officinale yellow starthistle Centaurea solstitialis
existing infestations are the highest priority. ricefield bulrush Schoenoplectus mucronatus indigobush Amorpha fruticosa
Eradication of all Class A plants is required by law. sage, clary Salvia sclarea knapweed, black Centaurea nigra Class C Weeds
sage, Mediterranean Salvia aethiopis knapweed, brown Centaurea jacea absinth wormwood Artemisia absinthium
Class B Weeds: Non-native species presently shiny geranium Geranium lucidum knapweed, diffuse Centaurea diffusa babysbreath Gypsophila paniculata
limited to portions of the State. Species are designated silverleaf nightshade Solanum elaeagnifolium knapweed, meadow Centaurea jacea x nigra black henbane Hyoscyamus niger
for control in regions where they are not yet Spanish broom Spartium junceum knapweed, Russian Acroptilon repens cereal rye Secale cereale
widespread. Preventing new infestations in these areas common groundsel Senecio vulgaris
spurge flax Thymelaea passerina knapweed, spotted Centaurea stoebe
is a high priority. In regions where a Class B species is common St. Johnswort Hypericum perforatum
Syrian bean-caper Zygophyllum fabago knotweed, Bohemian Polygonum bohemicum
already abundant, control is decided at the local level, common tansy Tanacetum vulgare
with containment as the primary goal. Please contact Texas blueweed Helianthus ciliaris knotweed, giant Polygonum sachalinense
thistle, Italian Carduus pycnocephalus knotweed, Himalayan Polygonum polystachyum curly-leaf pondweed Potamogeton crispus
your County Noxious Weed Control Coordinator to
thistle, milk Silybum marianum knotweed, Japanese Polygonum cuspidatum English ivy - four Hedera helix 'Baltica’,
learn which species are designated in your area.
thistle, slenderflower Carduus tenuiflorus kochia Kochia scoparia cultivars only 'Pittsburgh', and 'Star'; H.
variable-leaf milfoil Myriophyllum heterophyllum lawnweed Soliva sessilis hibernica 'Hibernica'
Class C Weeds: Noxious weeds which are already evergreen blackberry Rubus laciniatus
widespread in WA or are of special interest to the velvetleaf Abutilon theophrasti lepyrodiclis Lepyrodiclis holosteoides
wild four o'clock Mirabilis nyctaginea longspine sandbur Cenchrus longispinus field bindweed Convolvulus arvensis
state’s agricultural industry. The Class C status allows
loosestrife, garden Lysimachia vulgaris fragrant water lily Nymphaea odorata
counties to enforce control if locally desired. Other
Class B Weeds loosestrife, purple Lythrum salicaria hairy whitetop Cardaria pubescens
counties may choose to provide education or technical
consultation. Austrian fieldcress Rorippa austriaca loosestrife, wand Lythrum virgatum hairy willow-herb Epilobium hirsutum
blackgrass Alopecurus myosuroides oxeye daisy Leucanthemum vulgare hawkweed, common Hieracium lachenalii
Class A Weeds blueweed Echium vulgare parrotfeather Myriophyllum aquaticum hawkweeds, nonnative Hieracium spp.
Eradication is required Brazilian elodea Egeria densa perennial pepperweed Lepidium latifolium and invasive species
bugloss, annual Anchusa arvensis perennial sowthistle Sonchus arvensis ssp. not listed elsewhere
buffalobur Solanum rostratum
bugloss, common Anchusa officinalis arvensis Himalayan blackberry Rubus armeniacus
common crupina Crupina vulgaris
butterfly bush Buddleja davidii policeman’s helmet Impatiens glandulifera hoary cress Cardaria draba
cordgrass, common Spartina anglica
camelthorn Alhagi maurorum poison-hemlock Conium maculatum jointed goatgrass Aegilops cylindrica
cordgrass, dense flower Spartina densiflora
common catsear Hypochaeris radicata puncturevine Tribulus terrestris old man's beard Clematis vitalba
cordgrass, salt meadow Spartina patens
common fennel Foeniculum vulgare rush skeletonweed Chondrilla juncea reed canarygrass Phalaris arundinacea
cordgrass, smooth Spartina alterniflora
common reed Phragmites australis saltcedar Tamarix ramosissima scentless mayweed Matricaria perforata
dyers woad Isatis tinctoria
(nonnative genotypes) Scotch broom Cytisus scoparius smoothseed alfalfa Cuscuta approximata
eggleaf spurge Euphorbia oblongata
Dalmatian toadflax Linaria dalmatica ssp. spurge laurel Daphne laureola dodder
false brome Brachypodium sylvaticum
dalmatica spurge, leafy Euphorbia esula spikeweed Hemizonia pungens
floating primrose-willow Ludwigia peploides
Eurasian watermilfoil Myriophyllum spicatum spurge, myrtle Euphorbia myrsinites spiny cocklebur Xanthium spinosum
flowering rush Butomus umbellatus
fanwort Cabomba caroliniana sulfur cinquefoil Potentilla recta thistle, bull Cirsium vulgare
garlic mustard Alliaria petiolata
gorse Ulex europaeus swainsonpea Sphaerophysa salsula thistle, Canada Cirsium arvense
giant hogweed Heracleum mantegazzianum
grass-leaved arrowhead Sagittaria graminea tansy ragwort Senecio jacobaea white cockle Silene latifolia ssp. alba
goatsrue Galega officinalis
hawkweed oxtongue Picris hieracioides thistle, musk Carduus nutans yellow archangel Lamiastrum galeobdolon
hawkweed, European Hieracium sabaudum
hawkweed, mouseear Hieracium pilosella thistle, plumeless Carduus acanthoides yellow flag iris Iris pseudacorus
hawkweed, yellow devil Hieracium floribundum
hawkweed, orange Hieracium aurantiacum thistle, Scotch Onopordum acanthium yellow toadflax Linaria vulgaris
hydrilla Hydrilla verticillata
johnsongrass Sorghum halepense hawkweed, polar Hieracium atratum water primrose Ludwigia hexapetala New additions to the 2009 Noxious Weed List
knapweed, bighead Centaurea macrocephala hawkweed, queen-devil Hieracium glomeratum white bryony Bryonia alba
knapweed, Vochin Centaurea nigrescens hawkweed, smooth Hieracium laevigatum wild carrot Daucus carota Change in Noxious Weed Class
kudzu Pueraria montana var. lobata hawkweed, yellow Hieracium caespitosum wild chervil Anthriscus sylvestris
* New additions to the 2008 Noxious Weed List
Noxious Weeds are non-native plants To help protect the State’s resources and To learn more about noxious weeds and
introduced to Washington State that can
be highly destructive, competitive, and
economy, the Washington State Noxious
Weed Control Board adopts a State
noxious weed control in Washington
State, please contact:
2009
difficult to control. These plants invade our Noxious Weed List each year (WAC 16- Washington State
750). This list classifies weeds into three
Noxious Weed List
croplands, rangeland, forests, parks,
rivers, lakes, wetlands, and estuaries major classes – A, B, and C – based on
causing both ecological and economical the stage of invasion of each species and WA State Noxious Weed Control Board
damage that affects us all. Noxious the seriousness of the threat they pose to P.O. Box 42560
Olympia, WA 98504-2560
weeds can: Washington State. This classification (360)-725-5764
Lower crop yields system is designed to:
Email: noxiousweeds@agr.wa.gov
Reduce forage quality Prevent small infestations from
Website: http://www.nwcb.wa.gov
expanding by eradicating them
Destroy plant and animal habitat
when they are first detected Or
Displace native plants
WA State Department of Agriculture
Reduce recreational opportunities Restrict already established weed 21 North First Avenue #103
(e.g., fishing, hunting, swimming Yakima, WA 98902
populations to regions of the state (509) 225-2604
and hiking)
where they occur and prevent their
Clog waterways Or
movement to un-infested areas
Decrease land values Your local County
Noxious Weed Control Board
Allow flexibility of weed control at
Increase erosion and wildfire risk
the local level for weeds that are
already widespread. Shiny geranium, Geranium lucidum,
And some are toxic to humans and
a new Class A noxious weed
livestock
Figure from Deutschlands Flora in
Abbildungen at http://www.biolib by
Please help protect Washington’s
Johann Georg Sturm in 1796.
economy and environment
Image taken from Wikimedia Commons
from noxious weeds!
* New additions to the 2008 Noxious Weed List