Noxious Weeds

Quarantine List

The Washington State Department of Agriculture (WSDA) maintains a quarantine list of plants, also called the prohibited plants list, whose sale or distribution is prohibited in the state. All Class A noxious weeds are on this list. There are also plants on the list to prevent them from being imported and spread in our state. WSDA recently added three species to the quarantine list: (oriental clematis (Clematis orientalis), French broom (Genista monspessulana), and giant reed (Arundo donax), (except variegated cultivars). Click here to download a copy of the quarantine list.

 

velvetleaf
Abutilon theophrasti
garlic mustard
Alliaria petiolata
indigobush
Amorpha fruticosa
common bugloss
Anchusa officinalis
wild chervil
Anthriscus sylvestris




 

giant reed
Arundo donax (except variegated cultivars)
false brome
Brachypodium sylvaticum
flowering rush
Butomus umbellatus
fanwort
Cabomba caroliniana
plumeless thistle
Carduus acanthoides
Arundo donax
false brome
flowering rush
fanwort plumeless thistle

 

musk thistle
Carduus nutans
Italian thistle
Carduus pycnocephalus
slenderflower thistle
Carduus tenuiflorus
purple starthistle
Centaurea calcitrapa
diffuse knapweed
Centaurea diffusa
musk thistle
Italian thistle
slenderflower thistle
purple starthistle diffuse knapweed

 

brown knapweed
Centaurea jacea
meadow knapweed
Centaurea jacea x nigra
spotted knapweed
Centaurea stoebe
bighead knapweed
Centaurea macrocephala
black knapweed
Centaurea nigra
brown knapweed
meadow knapweed
spotted knapweed
bighead knapweed black knapweed

 

Vochin knapweed
Centaurea nigrescens
dwarf snapdragon
Chaenorrhinum minus
oriental clematis
Clematis orientalis
Australian swamp stonecrop
Crassula helmsii
common crupina
Crupina vulgaris
Vochin knapweed
dwarf snapdragon
clematis orientalis
Australian swamp stonecrop

 

purple nutsedge
Cyperus rotundus
Scotch broom
Cytisus scoparius
Queen Anne's lace
Daucus carota
blueweed
Echium vulgare
Brazilian elodea
Egeria densa
Crupina vulgaris
purple nutsedge
Scotch broom
Queen Anne's lace
blueweed Brazilian elodea

 

hairy willowherb
Epilobium hirsutum
leafy spurge
Euphorbia esula
eggleaf spurge
Euphorbia oblongata
goatsrue
Galega officinalis
French broom
Genista monspessulana
hairy willowherb
leafy spurge
coming soon
goatsrue French broom

 

shiny geranium
Geranium lucidum
mud mat
Glossostigma diandrum
reed sweetgrass
Glyceria maxima
Texas blueweed
Helianthus ciliaris
giant hogweed
Heracleum mantegazzianum
shiny geranium
coming soon
reed sweetgrass
Texas blueweed giant hogweed

 

Venice mallow
Hibiscus trionum
orange hawkweed
Hieracium aurantiacum
yellow hawkweed
Hieracium caespitosum
yellow devil hawkweed
Hieracium floribundum
mouseear hawkweed
Hieracium pilosella
Venice mallow
orange hawkweed
yellow hawkweed
yellow devil hawkweed mouseear hawkweed

 

European hawkweed
Hieracium sabaudum
hydrilla
Hydrilla verticillata
European frog-bit
Hydrocharis morsus-ranae
policeman's helmet
Impatiens glandulifera
dyer's woad
Isatis tinctoria
European hawkweed
hydrilla
European frog-bit
policeman's helmet dyer's woad

 

kochia
Kochia scoparia
African elodea
Lagarosiphon major
perennial pepperweed
Lepidium latifolium
oxeye daisy
Leucanthemum vulgare
Dalmatian toadflax
Linaria dalmatica ssp. dalmatica
kochia
coming soon
perennial pepperweed
oxeye daisy coming soon

 

water primrose
Ludwigia hexapetala
floating primrose-willow
Ludwigia peploides
garden loosestrife
Lysimachia vulgaris
purple loosestrife
Lythrum salicaria
wand loosestrife
Lythrum virgatum
water primrose
floating primrose-willow
garden loosestrife
coming soon coming soon

 

wild four o'clock
Mirabilis nyctaginea
marsh dew flower
Murdannia keisak
parrotfeather
Myriophyllum aquaticum
variable-leaf milfoil
Myriophyllum heterophyllum
Eurasian watermilfoil
Myriophyllum spicatum
wild four o'clock
coming soon
parrotfeather
variable-leaf milfoil Eurasian watermilfoil

 

slender-leaved naiad
Najas minor
yellow floating heart
Nymphoides peltata
Scotch thistle
Onopordum acanthium
Japanese knotweed
Polygonum cuspidatum
Himalayan knotweed
Polygonum polystachyum
coming soon
yellow floating heart
Scotch thistle
Japanese knotweed Himalayan knotweed

 

giant knotweed
Polygonum sachalinense
Bohemian knotweed
Polygonum x bohemicum
unicorn-plant
Proboscidea louisianica
kudzu
Pueraria montana var. lobata
grass-leaved arrowhead
Sagittaria graminea
giant knotweed
Bohemian knotweed
unicorn plant
kudzu grass-leaved arrowhead

 

delta arrowhead
Sagittaria platyphylla
Mediterranean sage
Salvia aethiopis
meadow clary
Salvia pratensis
clary sage
Salvia sclarea
ricefield bulrush
Schoenoplectus mucronatus
coming soon
Mediterranean sage
meadow clary
clary sage ricefield bulrush

 

tansy ragwort
Senecio jacobaea
milk thistle
Silybum marianum
silverleaf nightshade
Solanum elaeagnifolium
milk thistle
Silybum marianum
buffalobur
Solanum rostratum
tansy ragwort
milk thistle
silverleaf nightshade
coming soon buffalobur

 

lawnweed
Soliva sessilis
Johnsongrass
Sorghum halepense
smooth cordgrass
Spartina alterniflora
common cordgrass
Spartina anglica
dense-flowered cordgrass
Spartina densiflora
lawnweed
Johnsongrass
coming soon
coming soon coming soon

 

salt meadow cordgrass
Spartina patens
Spanish broom
Spartium junceum
water soldier
Stratiotes aloides
saltcedar
Tamarix ramosissima
spurge flax
Thymelaea passerina
coming soon
coming soon
coming soon
coming soon coming soon

 

hedgeparsley
Torilis arvensis
water chestnut
Trapa natans
water caltrap
Trapa bicornus
gorse
Ulex europaeus
swollen bladderwort
Utricularia inflata
hedge parsley
coming soon
coming soon
gorse coming soon

 

Syrian bean-caper
Zygophyllum fabago
       
Syrian bean-caper


 

Please Note: This prohibited plant list comprises the most recent and accepted scientific and common names of the prohibited plant species in Washington State. However, the prohibited status also applies to any and all synonyms.