Ezina · A field manual for plant care · Contiguous U.S.Vol. I · Ed. 2027 · Proof copy

Invasive plants regulated in Oregon

Oregon lists 126 plants as noxious weeds under OAR 603-052-1200. The table below reproduces that list in full, showing each plant's status in the state's own words. Oregon'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].

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7 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 Oregon 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. 89 of the 126 plants below carry both: Oregon names them in statute and GRIIS lists them as invasive in the United States. The other 37 are regulated by Oregon 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 Oregon’s determination
Alkali Swainsonpea Sphaerophysa salsula Listed Oregon lists Alkali Swainsonpea under “B designated weed.”
Atlantic Ivy Hedera hibernica Listed Invasive Oregon lists Atlantic Ivy under “B designated weed.”
Barbed Goatgrass Aegilops triuncialis Listed Invasive Oregon lists Barbed Goatgrass under “A designated weed.”
Biddy-Biddy Acaena novae-zelandiae Listed Oregon lists Biddy-Biddy under “B designated weed.”
Blessed Milkthistle Silybum marianum Listed Invasive Oregon lists Blessed Milkthistle under “B designated weed.”
Bohemian Knotweed Polygonum x bohemicum Listed Oregon lists Bohemian Knotweed under “B designated weed.”
Brazilian Waterweed Egeria densa Listed Invasive Oregon lists Brazilian Waterweed under “B designated weed.”Plant instead: Star Sedge, Geyer's Sedge, Inland Sedge
Broadleaved Pepperweed Lepidium latifolium Listed Invasive Oregon lists Broadleaved Pepperweed under “B designated weed.”
Bull Cottonthistle Onopordum tauricum Listed Oregon lists Bull Cottonthistle under “A designated weed.”
Bull Thistle Cirsium vulgare Listed Invasive Oregon lists Bull Thistle under “B designated weed.”
Burningbush Bassia scoparia Listed Invasive Oregon lists Burningbush under “B designated weed.”
Butter and Eggs Linaria vulgaris Listed Invasive Oregon lists Butter and Eggs under “B designated weed.”
Butterfly Bush Buddleja davidii Listed Invasive Oregon lists Butterfly Bush under “B designated weed.”
Camelthorn Alhagi maurorum Listed Invasive Oregon lists Camelthorn under “A designated weed.”
Canada Thistle Cirsium arvense Listed Invasive Oregon lists Canada Thistle under “B designated weed.”
Cape-Ivy Delairea odorata Listed Invasive Oregon lists Cape-Ivy under “A designated weed.”
Carelessweed US native Amaranthus palmeri Listed Oregon lists Carelessweed under “A designated weed.”
Coltsfoot Tussilago farfara Listed Invasive Oregon lists Coltsfoot under “A designated weed.”Plant instead: Yerba Mansa, California Damsonium, American Bistort
Common Bugloss Anchusa officinalis Listed Oregon lists Common Bugloss under “B designated weed.”
Common Cordgrass Spartina anglica Listed Oregon lists Common Cordgrass under “A designated weed.”
Common Crupina Crupina vulgaris Listed Invasive Oregon lists Common Crupina under “B designated weed.”
Common Frogbit Hydrocharis morsus-ranae Listed Invasive Oregon lists Common Frogbit under “A designated weed.”
Common Gorse Ulex europaeus Listed Invasive Oregon lists Common Gorse under “B designated weed.”
Common Reed Phragmites australis Listed Oregon lists Common Reed under “B designated weed.”
Common St. Johnswort Hypericum perforatum Listed Invasive Oregon lists Common St. Johnswort under “B designated weed.”
Common Viper's Bugloss Echium vulgare Listed Invasive Oregon lists Common Viper's Bugloss under “B designated weed.”
Creeping Spurge Euphorbia myrsinites Listed Oregon lists Creeping Spurge under “B designated weed.”
Cultivated Knotweed Polygonum polystachyum Listed Invasive Oregon lists Cultivated Knotweed under “B designated weed.”
Cutleaf Teasel Dipsacus laciniatus Listed Invasive Oregon lists Cutleaf Teasel under “B designated weed.”
Dalmatian Toadflax Linaria dalmatica Listed Invasive Oregon lists Dalmatian Toadflax under “B designated weed.”
Delta Arrowhead US native Sagittaria platyphylla Listed Oregon lists Delta Arrowhead under “A designated weed.”
Denseflower Cordgrass Spartina densiflora Listed Oregon lists Denseflower Cordgrass under “A designated weed.”
Diffuse Knapweed Centaurea diffusa Listed Invasive Oregon lists Diffuse Knapweed under “B designated weed.”
Dog Rose Rosa canina Listed Invasive Oregon lists Dog Rose under “B designated weed.”
Dyer's Woad Isatis tinctoria Listed Invasive Oregon lists Dyer's Woad under “B designated weed.”
Eggleaf Spurge Euphorbia oblongata Listed Oregon lists Eggleaf Spurge under “A designated weed.”
English Ivy Hedera helix Listed Invasive Oregon lists English Ivy under “B designated weed.”
Eurasian Watermilfoil Myriophyllum spicatum Listed Invasive Oregon lists Eurasian Watermilfoil under “B designated weed.”
Evergreen Clematis Clematis vitalba Listed Invasive Oregon lists Evergreen Clematis under “B designated weed.”
False Indigobush US native Amorpha fruticosa Listed Oregon lists False Indigobush under “B designated weed.”
Field Bindweed Convolvulus arvensis Listed Invasive Oregon lists Field Bindweed under “B designated weed.”
Fig Buttercup Ranunculus ficaria Listed Invasive Oregon lists Fig Buttercup under “B designated weed.”Plant instead: Snow Buckwheat, Old Man's Whiskers, Sticky Cinquefoil
Floating Primrose-Willow Ludwigia peploides Listed Oregon lists Floating Primrose-Willow under “B designated weed.”
Flowering Rush Butomus umbellatus Listed Invasive Oregon lists Flowering Rush under “A designated weed.”Plant instead: Showy Milkweed, Desert Sweet, Western Water Hemlock
French Broom Genista monspessulana Listed Invasive Oregon lists French Broom under “B designated weed.”
Garden Yellow Loosestrife Lysimachia vulgaris Listed Invasive Oregon lists Garden Yellow Loosestrife under “A designated weed.”
Garlic Mustard Alliaria petiolata Listed Invasive Oregon lists Garlic Mustard under “B designated weed.”
Giant Hogweed Heracleum mantegazzianum Listed Invasive Oregon lists Giant Hogweed under “A designated weed.”
Giant Knotweed Polygonum sachalinense Listed Invasive Oregon lists Giant Knotweed under “B designated weed.”
Giant Reed Arundo donax Listed Invasive Oregon lists Giant Reed under “B designated weed.”
Gypsyflower Cynoglossum officinale Listed Invasive Oregon lists Gypsyflower under “B designated weed.”
Hardheads Acroptilon repens Listed Invasive Oregon lists Hardheads under “B designated weed.”
Harmal Peganum Peganum harmala Listed Invasive Oregon lists Harmal Peganum under “A designated weed.”
Himalayan Blackberry Rubus armeniacus Listed Oregon lists Himalayan Blackberry under “B designated weed.”
Hoary Alyssum Berteroa incana Listed Invasive Oregon lists Hoary Alyssum under “A designated weed.”
Iberian Knapweed Centaurea iberica Listed Oregon lists Iberian Knapweed under “A designated weed.”
Italian Plumeless Thistle Carduus pycnocephalus Listed Invasive Oregon lists Italian Plumeless Thistle under “B designated weed.”
Japanese Dodder Cuscuta japonica Listed Oregon lists Japanese Dodder under “A designated weed.”
Japanese Knotweed Fallopia japonica (potentially invasive weed) Listed Invasive Oregon lists Japanese Knotweed under “B designated weed.”
Jointed Goatgrass Aegilops cylindrica Listed Invasive Oregon lists Jointed Goatgrass under “B designated weed.”
Large-Flower Primrose-Willow Ludwigia grandiflora Listed Invasive Oregon lists Large-Flower Primrose-Willow under “B designated weed.”
Large-Flower Primrose-Willow Ludwigia grandiflora subsp. hexapetala Listed Oregon lists Large-Flower Primrose-Willow under “B designated weed.”
Leafy Spurge Euphorbia esula Listed Invasive Oregon lists Leafy Spurge under “B designated weed.”
Matgrass Nardus stricta Listed Invasive Oregon lists Matgrass under “A designated weed.”
Meadow Hawkweed Hieracium caespitosum Listed Invasive Oregon lists Meadow Hawkweed under “B designated weed.”
Mediterranean Sage Salvia aethiopis Listed Invasive Oregon lists Mediterranean Sage under “B designated weed.”
Medusahead Taeniatherum caput-medusae Listed Invasive Oregon lists Medusahead under “B designated weed.”
Mouseear Hawkweed Hieracium pilosella Listed Invasive Oregon lists Mouseear Hawkweed under “A designated weed.”
Nodding Plumeless Thistle Carduus nutans Listed Invasive Oregon lists Nodding Plumeless Thistle under “B designated weed.”
North Africa Grass Ventenata dubia Listed Invasive Oregon lists North Africa Grass under “B designated weed.”
Nutgrass Cyperus rotundus Listed Invasive Oregon lists Nutgrass under “A designated weed.”
Oneseed Hawthorn Crataegus monogyna Listed Invasive Oregon lists Oneseed Hawthorn under “B designated weed.”
Orange Hawkweed Hieracium aurantiacum Listed Invasive Oregon lists Orange Hawkweed under “A designated weed.”
Ornamental Jewelweed Impatiens glandulifera Listed Invasive Oregon lists Ornamental Jewelweed under “B designated weed.”
Ovate Goatgrass Aegilops geniculata Listed Oregon lists Ovate Goatgrass under “A designated weed.”
Paleyellow Iris Iris pseudacorus Listed Invasive Oregon lists Paleyellow Iris under “B designated weed.”Plant instead: Showy Milkweed, Desert Sweet, Western Water Hemlock
Parrot Feather Watermilfoil Myriophyllum aquaticum Listed Invasive Oregon lists Parrot Feather Watermilfoil under “B designated weed.”Plant instead: Velvet Bentgrass, Narrowleaf Water Plantain, Yerba Mansa
Perennial Pea Lathyrus latifolius Listed Invasive Oregon lists Perennial Pea under “B designated weed.”
Plume Grass Saccharum ravennae (Erianthus ravennae) Listed Oregon lists Plume Grass under “A designated weed.”
Poison Hemlock Conium maculatum Listed Invasive Oregon lists Poison Hemlock under “B designated weed.”
Pride of Teneriffe Echium pininana Listed Oregon lists Pride of Teneriffe under “B designated weed.”
Professor-Weed Galega officinalis Listed Invasive Oregon lists Professor-Weed under “A designated weed.”
Puncturevine Tribulus terrestris Listed Invasive Oregon lists Puncturevine under “B designated weed.”
Purple Loosestrife Lythrum salicaria Listed Invasive Oregon lists Purple Loosestrife under “B designated weed.”Plant instead: Showy Milkweed, Desert Sweet, Western Water Hemlock
Purple Pampas Grass Cortaderia jubata Listed Invasive Oregon lists Purple Pampas Grass under “B designated weed.”
Red Star-Thistle Centaurea calcitrapa Listed Invasive Oregon lists Red Star-Thistle under “A designated weed.”
Reed Canarygrass US native Phalaris arundinacea Listed Oregon lists Reed Canarygrass under “B designated weed.”Plant instead: Common Rush, Western Brackenfern, California Bulrush
Robert Geranium Geranium robertianum Listed Oregon lists Robert Geranium under “B designated weed.”
Rush Skeletonweed Chondrilla juncea Listed Invasive Oregon lists Rush Skeletonweed under “B designated weed.”
Saltcedar Tamarix ramosissima Listed Invasive Oregon lists Saltcedar under “B designated weed.”
Saltlover Halogeton glomeratus Listed Invasive Oregon lists Saltlover under “B designated weed.”
Saltmeadow Cordgrass US native Spartina patens Listed Oregon lists Saltmeadow Cordgrass under “A designated weed.”
Salvation Jane Echium plantagineum Listed Invasive Oregon lists Salvation Jane under “A designated weed.”
Scotch Broom Cytisus scoparius Listed Invasive Oregon lists Scotch Broom under “B designated weed.”Plant instead: Desert Sweet, Pacific Lupine, Silky Lupine
Scotch Cottonthistle Onopordum acanthium Listed Invasive Oregon lists Scotch Cottonthistle under “B designated weed.”
Shining Geranium Geranium lucidum Listed Oregon lists Shining Geranium under “B designated weed.”
Slender False Brome Brachypodium sylvaticum Listed Invasive Oregon lists Slender False Brome under “B designated weed.”
Smooth Cordgrass US native Spartina alterniflora Listed Oregon lists Smooth Cordgrass under “A designated weed.”
Spanish Broom Spartium junceum Listed Invasive Oregon lists Spanish Broom under “B designated weed.”
Spanish Heath Erica lusitanica Listed Invasive Oregon lists Spanish Heath under “B designated weed.”
Spiny Plumeless Thistle Carduus acanthoides Listed Invasive Oregon lists Spiny Plumeless Thistle under “A designated weed.”
Spotted Knapweed Centaurea stoebe Listed Invasive Oregon lists Spotted Knapweed under “B designated weed.”
Spurgelaurel Daphne laureola Listed Oregon lists Spurgelaurel under “B designated weed.”
Squarrose Knapweed Centaurea virgata Listed Oregon lists Squarrose Knapweed under “A designated weed.”
Stinking Willie Senecio jacobaea Listed Invasive Oregon lists Stinking Willie under “B designated weed.”
Striated Broom Cytisus striatus Listed Invasive Oregon lists Striated Broom under “B designated weed.”
Sulphur Cinquefoil Potentilla recta Listed Invasive Oregon lists Sulphur Cinquefoil under “B designated weed.”
Summer Pheasant's Eye Adonis aestivalis Listed Oregon lists Summer Pheasant's Eye under “B designated weed.”
Sweet Briar Rose Rosa rubiginosa (R.eglanteria) Listed Invasive Oregon lists Sweet Briar Rose under “B designated weed.”
Tall Hawkweed Hieracium piloselloides Listed Invasive Oregon lists Tall Hawkweed under “A designated weed.”
Tree of Heaven Ailanthus altissima Listed Invasive Oregon lists Tree of Heaven under “B designated weed.”Plant instead: Narrowleaf Cottonwood, Osage-Orange, Quaking Aspen
Tyrol Knapweed Centaurea nigrescens Listed Oregon lists Tyrol Knapweed under “B designated weed.”
Upright Pepperweed US native Lepidium strictum Listed Oregon lists Upright Pepperweed under “B designated weed.”
Water Chestnut Trapa natans Listed Invasive Oregon lists Water Chestnut under “A designated weed.”Plant instead: Velvet Bentgrass, Narrowleaf Water Plantain, Yerba Mansa
Water Soldiers Stratiotes aloides Listed Oregon lists Water Soldiers under “A designated weed.”Plant instead: Velvet Bentgrass, Narrowleaf Water Plantain, Yerba Mansa
Waterthyme Hydrilla verticillata Listed Invasive Oregon lists Waterthyme under “A designated weed.”Plant instead: Star Sedge, Geyer's Sedge, Inland Sedge
West Indian Spongeplant Limnobium laevigatum Listed Oregon lists West Indian Spongeplant under “A designated weed.”
White Bryony Bryonia alba Listed Invasive Oregon lists White Bryony under “A designated weed.”
Winged Plumeless Thistle Carduus tenuiflorus Listed Oregon lists Winged Plumeless Thistle under “B designated weed.”
Woolly Distaff Thistle Carthamus lanatus subsp. creticus Listed Oregon lists Woolly Distaff Thistle under “A designated weed.”
Woolly Distaff Thistle Carthamus lanatus Listed Invasive Oregon lists Woolly Distaff Thistle under “A designated weed.”
Yellow Archangel Lamiastrum galeobdolon Listed Invasive Oregon lists Yellow Archangel under “B designated weed.”
Yellow Floatingheart Nymphoides peltata Listed Invasive Oregon lists Yellow Floatingheart under “A designated weed.”Plant instead: Yerba Mansa, Wavyleaf Indian Paintbrush, Harsh Indian Paintbrush
Yellow Nutsedge Cyperus esculentus Listed Oregon lists Yellow Nutsedge under “B designated weed.”
Yellow Star-Thistle Centaurea solstitialis Listed Invasive Oregon lists Yellow Star-Thistle under “B designated weed.”
Yellowtuft Alyssum murale Listed Oregon lists Yellowtuft under “A designated weed.”

What the tags mean

Prohibited Restricted Listed

A legal status. Oregon 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 Oregon’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

Oregon listings
OAR 603-052-1200. 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 Oregon’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 Oregon

Plants that two or more states bordering Oregon regulate, and Oregon 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.

Questions

What plants are illegal to sell in Oregon?

Oregon'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. 126 plants are named under OAR 603-052-1200. 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 Oregon?

Search the table on this page, or enter the plant's name in Ezina's checker to get its Oregon 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 Oregon?

No. This page reproduces what Oregon 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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Compiled from peer-reviewed research, USDA documentation,
and direct scientific observation across the 48 contiguous states.

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