Invasive plants regulated in Washington (166 species, cited)

Invasive plants regulated in Washington

Washington lists 166 plants as noxious weeds under WAC 16-750. The table below reproduces that list in full, showing each plant's status in the state's own words. Washington's list is an agricultural noxious-weed law, which governs control and spread on farmland and rights of way rather than what a nursery may sell.

Compiled from the rule itself, retrieved July 20, 2026. Law changes; if you spot a listing we have wrong or stale, tell us at [email protected].

22 of these plants are native to part of the United States, marked US native below. Nativity is regional. Black locust is native to the Appalachians and regulated in New England; Palmer amaranth is native to the Southwest and listed as an agricultural weed in the Corn Belt. A listing tells you what Washington regulates, not where a plant belongs. The county checker answers the second question.

Regulated and invasive are two different findings, and this page shows them separately. 110 of the 166 plants below carry both: Washington names them in statute and GRIIS lists them as invasive in the United States. The other 56 are regulated by Washington without appearing on that register. The reverse is far more common still: most plants GRIIS calls invasive are named in no state’s statute at all and are sold freely, so an absent chip is never a clean bill of health.

Plant	Scientific name	Status	Washington’s determination
American Spongeplant US native	Limnobium spongia	Prohibited	Washington lists American Spongeplant under “Class A.”
Bighead Knapweed	Centaurea macrocephala	Prohibited Invasive	Washington lists Bighead Knapweed under “Class A.”
Blessed Milkthistle	Silybum marianum	Prohibited Invasive	Washington lists Blessed Milkthistle under “Class A.”
Bog Bulrush	Schoenoplectiella mucronata	Prohibited Invasive	Washington lists Bog Bulrush under “Class A.”
Carelessweed US native	Amaranthus palmeri	Prohibited	Washington lists Carelessweed under “Class A.”
Clary Sage	Salvia sclarea	Prohibited	Washington lists Clary Sage under “Class A.”
Common Cordgrass	Spartina anglica	Prohibited	Washington lists Common Cordgrass under “Class A.”
Common Crupina	Crupina vulgaris	Prohibited Invasive	Washington lists Common Crupina under “Class A.”
Delta Arrowhead US native	Sagittaria platyphylla	Prohibited	Washington lists Delta Arrowhead under “Class A.”
Denseflower Cordgrass	Spartina densiflora	Prohibited	Washington lists Denseflower Cordgrass under “Class A.”
Dyer's Woad	Isatis tinctoria	Prohibited Invasive	Washington lists Dyer's Woad under “Class A.”
Eggleaf Spurge	Euphorbia oblongata	Prohibited	Washington lists Eggleaf Spurge under “Class A.”
Floating Primrose-Willow	Ludwigia peploides	Prohibited	Washington lists Floating Primrose-Willow under “Class A.”
Flowering Rush	Butomus umbellatus	Prohibited Invasive	Washington lists Flowering Rush under “Class A.”Plant instead: Showy Milkweed, Western Water Hemlock, Western Goldenrod
French Broom	Genista monspessulana	Prohibited Invasive	Washington lists French Broom under “Class A.”
Garlic Mustard	Alliaria petiolata	Prohibited Invasive	Washington lists Garlic Mustard under “Class A.”
Giant Hogweed	Heracleum mantegazzianum	Prohibited Invasive	Washington lists Giant Hogweed under “Class A.”
Heartleaf Four O'clock US native	Mirabilis nyctaginea	Prohibited	Washington lists Heartleaf Four O'clock under “Class A.”
Introduced Sage	Salvia pratensis	Prohibited	Washington lists Introduced Sage under “Class A.”
Italian Plumeless Thistle	Carduus pycnocephalus	Prohibited Invasive	Washington lists Italian Plumeless Thistle under “Class A.”
Johnsongrass	Sorghum halepense	Prohibited Invasive	Washington lists Johnsongrass under “Class A.”
Kudzu	Pueraria montana	Prohibited Invasive	Washington lists Kudzu under “Class A.”Plant instead: Bog Birch, Western Hackberry, Sitka Willow
Marsh Thistle	Cirsium palustre	Prohibited Invasive	Washington lists Marsh Thistle under “Class A.”
Mediterranean Sage	Salvia aethiopis	Prohibited Invasive	Washington lists Mediterranean Sage under “Class A.”
Oriental Bittersweet	Celastrus orbiculatus	Prohibited Invasive	Washington lists Oriental Bittersweet under “Class A.”Plant instead: Blue Elderberry, Sitka Alder, Western Dogwood
Oriental Virginsbower	Clematis orientalis	Prohibited	Washington lists Oriental Virginsbower under “Class A.”
Professor-Weed	Galega officinalis	Prohibited Invasive	Washington lists Professor-Weed under “Class A.”
Red Star-Thistle	Centaurea calcitrapa	Prohibited Invasive	Washington lists Red Star-Thistle under “Class A.”
Roughfruit Amaranth US native	Amaranthus tuberculatus	Prohibited	Washington lists Roughfruit Amaranth under “Class A.”
Saltmeadow Cordgrass US native	Spartina patens	Prohibited	Washington lists Saltmeadow Cordgrass under “Class A.”
Silverleaf Nightshade US native	Solanum elaeagnifolium	Prohibited	Washington lists Silverleaf Nightshade under “Class A.”
Slender False Brome	Brachypodium sylvaticum	Prohibited Invasive	Washington lists Slender False Brome under “Class A.”
Smallflower Touchmenot	Impatiens parviflora	Prohibited Invasive	Washington lists Smallflower Touchmenot under “Class A.”
Smooth Cordgrass US native	Spartina alterniflora	Prohibited	Washington lists Smooth Cordgrass under “Class A.”
Spanish Broom	Spartium junceum	Prohibited Invasive	Washington lists Spanish Broom under “Class A.”
Syrian Beancaper	Zygophyllum fabago	Prohibited Invasive	Washington lists Syrian Beancaper under “Class A.”
Texas Blueweed US native	Helianthus ciliaris	Prohibited	Washington lists Texas Blueweed under “Class A.”
Twoleaf Watermilfoil US native	Myriophyllum heterophyllum	Prohibited	Washington lists Twoleaf Watermilfoil under “Class A.”
Tyrol Knapweed	Centaurea nigrescens	Prohibited	Washington lists Tyrol Knapweed under “Class A.”
Variegated Water Grass	Glyceria maxima 'Variegata'	Prohibited Invasive	Washington lists Variegated Water Grass under “Class A.”Plant instead: Common Rush, Western Goldenrod, Rose Spirea
Waterthyme	Hydrilla verticillata	Prohibited Invasive	Washington lists Waterthyme under “Class A.”Plant instead: Star Sedge, Geyer's Sedge, Inland Sedge
West Indian Spongeplant	Limnobium laevigatum	Prohibited	Washington lists West Indian Spongeplant under “Class A.”
Western Watermilfoil US native	Myriophyllum hippuroides	Prohibited	Washington lists Western Watermilfoil under “Class A.”
Winged Plumeless Thistle	Carduus tenuiflorus	Prohibited	Washington lists Winged Plumeless Thistle under “Class A.”
Absinthium	Artemisia absinthium	Listed Invasive	Washington lists Absinthium under “Class C.”
Alfalfa Dodder	Cuscuta approximata	Listed	Washington lists Alfalfa Dodder under “Class C.”
Alkali Swainsonpea	Sphaerophysa salsula	Listed	Washington lists Alkali Swainsonpea under “Class C.”
American White Waterlily US native	Nymphaea odorata	Listed	Washington lists American White Waterlily under “Class C.”
Atlantic Ivy	Hedera hibernica	Listed Invasive	Washington lists Atlantic Ivy under “Class C.”
Austrian Yellowcress	Rorippa austriaca	Listed Invasive	Washington lists Austrian Yellowcress under “Class C.”
Baby's Breath	Gypsophila paniculata	Listed Invasive	Washington lists Baby's Breath under “Class C.”
Black Henbane	Hyoscyamus niger	Listed Invasive	Washington lists Black Henbane under “Class C.”
Black Locust US native	Robinia pseudoacacia	Listed	Washington lists Black Locust under “Class C.”
Bladder Campion	Silene latifolia	Listed Invasive	Washington lists Bladder Campion under “Class C.”
Bohemian Knotweed	Polygonum x bohemicum	Listed	Washington lists Bohemian Knotweed under “Class B.”
Brazilian Waterweed	Egeria densa	Listed Invasive	Washington lists Brazilian Waterweed under “Class B.”Plant instead: Star Sedge, Geyer's Sedge, Inland Sedge
Broadleaved Pepperweed	Lepidium latifolium	Listed Invasive	Washington lists Broadleaved Pepperweed under “Class B.”
Bronze Fennel	Foeniculum vulgare 'Purpureum'	Listed Invasive	Washington lists Bronze Fennel under “Class B.”
Brownray Knapweed	Centaurea jacea	Listed Invasive	Washington lists Brownray Knapweed under “Class B.”
Buffalobur Nightshade US native	Solanum rostratum	Listed	Washington lists Buffalobur Nightshade under “Class C.”
Bull Thistle	Cirsium vulgare	Listed Invasive	Washington lists Bull Thistle under “Class C.”
Burningbush	Bassia scoparia	Listed Invasive	Washington lists Burningbush under “Class B.”
Butter and Eggs	Linaria vulgaris	Listed Invasive	Washington lists Butter and Eggs under “Class C.”
Butterfly Bush	Buddleja davidii	Listed Invasive	Washington lists Butterfly Bush under “Class B.”
Camelthorn	Alhagi maurorum	Listed Invasive	Washington lists Camelthorn under “Class B.”
Canada Thistle	Cirsium arvense	Listed Invasive	Washington lists Canada Thistle under “Class C.”
Carolina Fanwort US native	Cabomba caroliniana	Listed	Washington lists Carolina Fanwort under “Class B.”Plant instead: Star Sedge, Geyer's Sedge, Inland Sedge
Carrot	Daucus carota	Listed Invasive	Washington lists Carrot under “Class C.”
Cereal Rye	Secale cereale	Listed Invasive	Washington lists Cereal Rye under “Class C.”
Codlins and Cream	Epilobium hirsutum	Listed Invasive	Washington lists Codlins and Cream under “Class B.”
Coltsfoot	Tussilago farfara	Listed Invasive	Washington lists Coltsfoot under “Class B.”Plant instead: California Damsonium, American Bistort, American Vetch
Common Barberry	Berberis vulgaris	Listed Invasive	Washington lists Common Barberry under “Class C.”Plant instead: Pacific Lupine, Silky Lupine, Tailcup Lupine
Common Bugloss	Anchusa officinalis	Listed	Washington lists Common Bugloss under “Class B.”
Common Gorse	Ulex europaeus	Listed Invasive	Washington lists Common Gorse under “Class B.”
Common Reed	Phragmites australis	Listed	Washington lists Common Reed under “Class B.”
Common St. Johnswort	Hypericum perforatum	Listed Invasive	Washington lists Common St. Johnswort under “Class C.”
Common Tarweed US native	Centromadia pungens	Listed	Washington lists Common Tarweed under “Class C.”
Common Viper's Bugloss	Echium vulgare	Listed Invasive	Washington lists Common Viper's Bugloss under “Class B.”
Creeping Spurge	Euphorbia myrsinites	Listed	Washington lists Creeping Spurge under “Class B.”
Cultivated Knotweed	Polygonum polystachyum	Listed Invasive	Washington lists Cultivated Knotweed under “Class B.”
Curly Pondweed	Potamogeton crispus	Listed Invasive	Washington lists Curly Pondweed under “Class C.”
Cutleaf Blackberry	Rubus laciniatus	Listed Invasive	Washington lists Cutleaf Blackberry under “Class C.”
Dalmatian Toadflax	Linaria dalmatica	Listed Invasive	Washington lists Dalmatian Toadflax under “Class B.”
Diffuse Knapweed	Centaurea diffusa	Listed Invasive	Washington lists Diffuse Knapweed under “Class B.”
Dwarf Eelgrass	Nanozostera japonica	Listed	Washington lists Dwarf Eelgrass under “Class C.”
English Holly	Ilex aquifolium	Listed Invasive	Washington lists English Holly under “Class C.”
English Ivy	Hedera helix	Listed Invasive	Washington lists English Ivy under “Class C.”
Eurasian Watermilfoil	Myriophyllum spicatum	Listed Invasive	Washington lists Eurasian Watermilfoil under “Class B.”
European Beachgrass	Ammophila arenaria	Listed Invasive	Washington lists European Beachgrass under “Class C.”
European Wand Loosestrife	Lythrum virgatum	Listed	Washington lists European Wand Loosestrife under “Class B.”Plant instead: Showy Milkweed, Western Water Hemlock, Western Goldenrod
Evergreen Bugloss	Pentaglottis sempervirens	Listed Invasive	Washington lists Evergreen Bugloss under “Class C.”
Evergreen Clematis	Clematis vitalba	Listed Invasive	Washington lists Evergreen Clematis under “Class C.”
False Indigobush US native	Amorpha fruticosa	Listed	Washington lists False Indigobush under “Class B.”
Field Bindweed	Convolvulus arvensis	Listed Invasive	Washington lists Field Bindweed under “Class C.”
Field Burrweed	Soliva sessilis	Listed Invasive	Washington lists Field Burrweed under “Class C.”
Field Sowthistle	Sonchus arvensis	Listed Invasive	Washington lists Field Sowthistle under “Class C.”
Fig Buttercup	Ranunculus ficaria	Listed Invasive	Washington lists Fig Buttercup under “Class B.”Plant instead: Snow Buckwheat, Old Man's Whiskers, Sticky Cinquefoil
Fuller's Teasel	Dipsacus fullonum	Listed	Washington lists Fuller's Teasel under “Class C.”
Garden Yellow Loosestrife	Lysimachia vulgaris	Listed Invasive	Washington lists Garden Yellow Loosestrife under “Class B.”
Giant Knotweed	Polygonum sachalinense	Listed Invasive	Washington lists Giant Knotweed under “Class B.”
Grassy Arrowhead US native	Sagittaria graminea	Listed	Washington lists Grassy Arrowhead under “Class B.”
Gypsyflower	Cynoglossum officinale	Listed Invasive	Washington lists Gypsyflower under “Class B.”
Hairy Cat's Ear	Hypochaeris radicata	Listed Invasive	Washington lists Hairy Cat's Ear under “Class C.”
Hairy Whitetop	Cardaria pubescens	Listed	Washington lists Hairy Whitetop under “Class C.”
Hanging Sedge	Carex pendula	Listed	Washington lists Hanging Sedge under “Class B.”
Hawkweed Oxtongue	Picris hieracioides	Listed	Washington lists Hawkweed Oxtongue under “Class B.”
Himalayan Berry	Rubus bifrons	Listed Invasive	Washington lists Himalayan Berry under “Class C.”
Hoary Alyssum	Berteroa incana	Listed Invasive	Washington lists Hoary Alyssum under “Class B.”
Italian Arum	Arum italicum	Listed	Washington lists Italian Arum under “Class C.”
Japanese Knotweed	Fallopia japonica (potentially invasive weed)	Listed Invasive	Washington lists Japanese Knotweed under “Class B.”
Jewelweed US native	Impatiens capensis	Listed	Washington lists Jewelweed under “Class C.”
Jointed Goatgrass	Aegilops cylindrica	Listed Invasive	Washington lists Jointed Goatgrass under “Class C.”
Knapweed	Centaurea x pouzinii	Listed	Washington lists Knapweed under “Class B.”
Large-Flower Primrose-Willow	Ludwigia grandiflora subsp. hexapetala	Listed	Washington lists Large-Flower Primrose-Willow under “Class B.”
Leafy Spurge	Euphorbia esula	Listed Invasive	Washington lists Leafy Spurge under “Class B.”
Lenspod Whitetop	Cardaria chalepensis	Listed	Washington lists Lenspod Whitetop under “Class C.”
Lesser Knapweed	Centaurea nigra	Listed Invasive	Washington lists Lesser Knapweed under “Class B.”
Maltese Star-Thistle	Centaurea melitensis	Listed Invasive	Washington lists Maltese Star-Thistle under “Class B.”
Mat Sandbur US native	Cenchrus longispinus	Listed	Washington lists Mat Sandbur under “Class C.”
Medusahead	Taeniatherum caput-medusae	Listed Invasive	Washington lists Medusahead under “Class C.”
Mezereon	Thymelaea passerina	Listed	Washington lists Mezereon under “Class B.”
Narrowleaf Cattail	Typha angustifolia	Listed Invasive	Washington lists Narrowleaf Cattail under “Class C.”
Nodding Plumeless Thistle	Carduus nutans	Listed Invasive	Washington lists Nodding Plumeless Thistle under “Class B.”
North Africa Grass	Ventenata dubia	Listed Invasive	Washington lists North Africa Grass under “Class C.”
Norway Maple	Acer platanoides	Listed Invasive	Washington lists Norway Maple under “Class C.”Plant instead: Big Leaf Maple, Subalpine Larch, Pacific Yew
Old-Man-In-The-Spring	Senecio vulgaris	Listed Invasive	Washington lists Old-Man-In-The-Spring under “Class C.”
Oneseed Hawthorn	Crataegus monogyna	Listed Invasive	Washington lists Oneseed Hawthorn under “Class C.”
Orange Hawkweed	Hieracium aurantiacum	Listed Invasive	Washington lists Orange Hawkweed under “Class B.”
Ornamental Jewelweed	Impatiens glandulifera	Listed Invasive	Washington lists Ornamental Jewelweed under “Class B.”
Oxeye Daisy	Leucanthemum vulgare	Listed Invasive	Washington lists Oxeye Daisy under “Class C.”
Paleyellow Iris	Iris pseudacorus	Listed Invasive	Washington lists Paleyellow Iris under “Class C.”Plant instead: Showy Milkweed, Western Water Hemlock, Western Goldenrod
Parrot Feather Watermilfoil	Myriophyllum aquaticum	Listed Invasive	Washington lists Parrot Feather Watermilfoil under “Class B.”Plant instead: Narrowleaf Water Plantain, Douglas' Sedge, Little Green Sedge
Plume Grass	Saccharum ravennae (Erianthus ravennae)	Listed	Washington lists Plume Grass under “Class B.”
Poison Hemlock	Conium maculatum	Listed Invasive	Washington lists Poison Hemlock under “Class B.”
Puncturevine	Tribulus terrestris	Listed Invasive	Washington lists Puncturevine under “Class B.”
Purple Loosestrife	Lythrum salicaria	Listed Invasive	Washington lists Purple Loosestrife under “Class B.”Plant instead: Showy Milkweed, Western Water Hemlock, Western Goldenrod
Purple Pampas Grass	Cortaderia jubata	Listed Invasive	Washington lists Purple Pampas Grass under “Class C.”
Reed Canarygrass US native	Phalaris arundinacea	Listed	Washington lists Reed Canarygrass under “Class C.”Plant instead: Common Rush, Western Brackenfern, Western Goldenrod
Robert Geranium	Geranium robertianum	Listed	Washington lists Robert Geranium under “Class B.”
Rough Chervil	Chaerophyllum temulum	Listed	Washington lists Rough Chervil under “Class B.”
Rush Skeletonweed	Chondrilla juncea	Listed Invasive	Washington lists Rush Skeletonweed under “Class B.”
Russian Olive	Elaeagnus angustifolia	Listed Invasive	Washington lists Russian Olive under “Class C.”Plant instead: American Plum, Common Juniper, Vine Maple
Saltcedar	Tamarix ramosissima	Listed Invasive	Washington lists Saltcedar under “Class B.”
Scentless False Mayweed	Tripleurospermum perforatum	Listed Invasive	Washington lists Scentless False Mayweed under “Class C.”
Scotch Broom	Cytisus scoparius	Listed Invasive	Washington lists Scotch Broom under “Class B.”Plant instead: Pacific Lupine, Silky Lupine, Common Cowparsnip
Scotch Cottonthistle	Onopordum acanthium	Listed Invasive	Washington lists Scotch Cottonthistle under “Class B.”
Shining Geranium	Geranium lucidum	Listed	Washington lists Shining Geranium under “Class B.”
Slender Meadow Foxtail	Alopecurus myosuroides	Listed Invasive	Washington lists Slender Meadow Foxtail under “Class C.”
Small Bugloss	Anchusa arvensis	Listed	Washington lists Small Bugloss under “Class B.”
Spiny Cocklebur	Xanthium spinosum	Listed Invasive	Washington lists Spiny Cocklebur under “Class C.”
Spiny Plumeless Thistle	Carduus acanthoides	Listed Invasive	Washington lists Spiny Plumeless Thistle under “Class B.”
Spotted Knapweed	Centaurea stoebe	Listed Invasive	Washington lists Spotted Knapweed under “Class B.”
Spurgelaurel	Daphne laureola	Listed	Washington lists Spurgelaurel under “Class B.”
Stinking Willie	Senecio jacobaea	Listed Invasive	Washington lists Stinking Willie under “Class B.”
Sulphur Cinquefoil	Potentilla recta	Listed Invasive	Washington lists Sulphur Cinquefoil under “Class B.”
Tansy	Tanacetum vulgare	Listed Invasive	Washington lists Tansy under “Class B.”
Tree of Heaven	Ailanthus altissima	Listed Invasive	Washington lists Tree of Heaven under “Class C.”Plant instead: Subalpine Larch, Osage-Orange, Quaking Aspen
Uruguayan Pampas Grass	Cortaderia selloana	Listed Invasive	Washington lists Uruguayan Pampas Grass under “Class C.”
Velvetleaf	Abutilon theophrasti	Listed Invasive	Washington lists Velvetleaf under “Class B.”
White Bryony	Bryonia alba	Listed Invasive	Washington lists White Bryony under “Class B.”
Wild Basil US native	Clinopodium vulgare	Listed	Washington lists Wild Basil under “Class B.”
Wild Chervil	Anthriscus sylvestris	Listed Invasive	Washington lists Wild Chervil under “Class B.”
Yellow Archangel	Lamiastrum galeobdolon	Listed Invasive	Washington lists Yellow Archangel under “Class B.”
Yellow Floatingheart	Nymphoides peltata	Listed Invasive	Washington lists Yellow Floatingheart under “Class B.”Plant instead: Harsh Indian Paintbrush, Desert Centaury, California Damsonium
Yellow Nutsedge	Cyperus esculentus	Listed	Washington lists Yellow Nutsedge under “Class B.”
Yellow Star-Thistle	Centaurea solstitialis	Listed Invasive	Washington lists Yellow Star-Thistle under “Class B.”

What the tags mean

Prohibited Restricted Listed

A legal status. Washington names the plant in statute. Under a nursery rule that means it may not be sold, propagated, or moved; under an agricultural weed law it means landowners must control it. The cited rule says which, in Washington’s own words, in the last column.

Invasive

An ecological finding, and a different question from the law. GRIIS — the Global Register of Introduced and Invasive Species — lists the plant as invasive in the United States. Most invasive plants carry no state listing at all and are sold freely, so a plant without this tag is not thereby safe, and a plant without a legal chip is not thereby harmless.

Where this comes from

Washington listings: WAC 16-750. Read the rule.
Invasive status: GRIIS, the Global Register of Introduced and Invasive Species, via GBIF. A scientific register with no legal force; it is cited separately from the statute above because the two disagree far more often than they agree.
Status wording: Each determination is written as a sentence, with Washington’s own term for the plant reproduced verbatim inside it. The Prohibited / Restricted / Listed chips are Ezina’s normalisation across 42 states and are not the legal term.
Nativity: USDA PLANTS county distribution layer, surfaced through the county checker.

Regulated next door, but not in Washington

Plants that two or more states bordering Washington regulate, and Washington does not. A listing is a legal act rather than an ecological one, so a plant can be a documented problem here and still be sold here.

Common Frogbit Hydrocharis morsus-ranae regulated in Idaho, Oregon
Hardheads Acroptilon repens regulated in Idaho, Oregon
Iberian Knapweed Centaurea iberica regulated in Idaho, Oregon
Matgrass Nardus stricta regulated in Idaho, Oregon
Meadow Hawkweed Hieracium caespitosum regulated in Idaho, Oregon
Squarrose Knapweed Centaurea virgata regulated in Idaho, Oregon
Tall Hawkweed Hieracium piloselloides regulated in Idaho, Oregon
Water Chestnut Trapa natans regulated in Idaho, Oregon

Questions

What plants are illegal to sell in Washington?

Washington's list is an agricultural noxious-weed law, which governs control and spread on farmland and rights of way rather than what a nursery may sell. 166 plants are named under WAC 16-750. A noxious-weed listing does not automatically ban nursery sale, so check the rule itself before assuming a plant cannot be bought or sold.

Is my plant invasive in Washington?

Search the table on this page, or enter the plant's name in Ezina's checker to get its Washington status alongside whether USDA records it as native to your specific county. Every answer links the record it came from.

Does a plant missing from this list mean it is safe to plant in Washington?

No. This page reproduces what Washington regulates, and a state list is a legal instrument rather than an ecological verdict. Plenty of plants spread aggressively without ever being listed, and states add species years after the problem is documented.

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