Noxious Weeds
Quarantine List
The Washington State Department of Agriculture 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. 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 |
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| false brome Brachypodium sylvaticum |
plumeless thistle Carduus acanthoides |
musk thistle Carduus nutans |
Italian thistle Carduus pycnocephalus |
slenderflower thistle Carduus tenuiflorus |
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| purple starthistle Centaurea calcitrapa |
diffuse knapweed Centaurea diffusa |
brown knapweed Centaurea jacea |
meadow knapweed Centaurea jacea x nigra |
spotted knapweed Centaurea stoebe |
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| bighead knapweed Centaurea macrocephala |
black knapweed Centaurea nigra |
Vochin knapweed Centaurea nigrescens |
dwarf snapdragon Chaenorrhinum minus |
common crupina Crupina vulgaris |
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| Scotch broom Cytisus scoparius |
wild carrot Daucus carota |
blueweed Echium vulgare |
leafy spurge Euphorbia esula |
eggleaf spurge Euphorbia oblongata |
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| goatsrue Galega officinalis |
shiny geranium Geranium lucidum |
Texas blueweed Helianthus ciliaris |
giant hogweed Heracleum mantegazzianum |
Venice mallow Hibiscus trionum |
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| orange hawkweed Hieracium aurantiacum |
yellow hawkweed Hieracium caespitosum |
yellow devil hawkweed Hieracium floribundum |
mouseear hawkweed Hieracium pilosella |
European hawkweed Hieracium sabaudum |
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| policeman's helmet Impatiens glandulifera |
dyer's woad Isatis tinctoria |
kochia Kochia scoparia |
perennial pepperweed Lepidium latifolium |
oxeye daisy Leucanthemum vulgare |
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| Dalmatian toadflax Linaria dalmatica ssp. dalmatica |
wild four o'clock Mirabilis nyctaginea |
Scotch thistle Onopordum acanthium |
Japanese knotweed Polygonum cuspidatum |
Himalayan knotweed Polygonum polystachyum |
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| giant knotweed Polygonum sachalinense |
Bohemian knotweed Polygonum x bohemicum |
unicorn-plant Proboscidea louisianica |
kudzu Pueraria montana var. lobata |
Mediterranean sage Salvia aethiopis |
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| meadow clary Salvia pratensis |
clary sage Salvia sclarea |
tansy ragwort Senecio jacobaea |
milk thistle Silybum marianum |
silverleaf nightshade Solanum elaeagnifolium |
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| buffalobur Solanum rostratum |
lawnweed Soliva sessilis |
johnsongrass Sorghum halepense |
Spanish broom Spartium junceum |
saltcedar Tamarix ramosissima |
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| spurge flax Thymelaea passerina |
hedgeparsley Torilis arvensis |
gorse Ulex europaeus |
Syrian bean-caper Zygophyllum fabago |
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Lythrum Quarantine
WAC 16-752-400 - 415
It is prohibited to transport, buy, sell, offer for sale or to distribute plants, plant parts or seeds of Lythrum salicaria or L. virgatum into or within the state of Washington. Also prohibited is transportation of wild plants or plant parts of these species in the state of Wash-ington. This includes hybrid crosses and named cultivars of L. salicaria and L. virgatum.
| purple loosestrife Lythrum salicaria |
wand loosestrife Lythrum virgatum |
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Wetland and Aquatics
WAC 16-752-505
It is prohibited to transport, buy, sell, offer for sale, or to distribute plants or plant parts of these regulated plants, into or within the state of Washington. It is further prohibited to intentionally transplant wild plants and/or plant parts of these species within the state of Washington.
| flowering rush Butomus umbellatus |
fanwort Cabomba caroliniana |
Australian swamp stonecrop Crassula helmsii |
Brazilian elodea Egeria densa |
hairy willowherb Epilobium hirsutum |
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| mud mat Glossostigma diandrum |
reed sweetgrass Glyceria maxima |
hydrilla Hydrilla verticillata |
European frog-bit Hydrocharis morsus-ranae |
African elodea Lagarosiphon major |
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| water primrose Ludwigia hexapetala |
floating primrose-willow Ludwigia peploides |
garden loosestrife Lysimachia vulgaris |
marsh dew flower Murdannia keisak |
parrotfeather Myriophyllum aquaticum |
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| variable-leaf milfoil Myriophyllum heterophyllum |
Eurasian watermilfoil Myriophyllum spicatum |
slender-leaved naiad Najas minor |
yellow floating heart Nymphoides peltata |
grass-leaved arrowhead Sagittaria graminea |
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| delta arrowhead Sagittaria platyphylla |
ricefield bulrush Schoenoplectus mucronatus |
smooth cordgrass Spartina alterniflora |
common cordgrass Spartina anglica |
dense-flowered cordgrass Spartina densiflora |
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| salt meadow cordgrass Spartina patens |
water soldier Stratiotes aloides |
water chestnut Trapa natans |
water caltrap Trapa bicornus |
swollen bladderwort Utricularia inflata |
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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.
