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Sometimes plants used in landscapes are actually invasive plants and noxious weeds which will crowd out native plants. Avoid planting these plants. It is illegal to plant or transport plants which are listed as Oregon Noxious Weeds.
Click on Oregon Noxious Weeds Profiles for pictures and descriptions of noxious weeds arranged by common names.
A indicates plants targeted for eradication and must be reported to the Oregon Department of Agriculture within 48 hours.
B indicates plants that should not be allowed to spread.
Trees
Shrubs
Vines and Groundcovers
Perennials and Annuals
Aquatic and Wetland Plants
Scientific name Common name Description Trees Ailanthus altissima Tree of Heaven Oregon Noxious Weed B Crataegus monogyna English Hawthorn Oregon Noxious Weed B Elaeagnus angustifolia Russian Olive Invasive Plant Shrubs Buddleia davidii, B variabilis Butterfly Bush Oregon Noxious Weed B Cytisus scoparius Scotch Broom Oregon Noxious Weed B Cytisus striatus Portuguese Broom Oregon Noxious Weed B Daphne laureola Spurge Laurel Oregon Noxious Weed B Erica lusitanica Spanish Heath Oregon Noxious Weed B Genista monspessulana French Broom Oregon Noxious Weed B Ilex aquifolium English Holly Invasive Plant Rosa canina Dog Rose Oregon Noxious Weed B Rosa rubiginosa Sweetbriar Rose Oregon Noxious Weed B Rubus armeniacus Armenian Blackberry Oregon Noxious Weed B Rubus discolor (R. procerus) Himalayan Blackberry Oregon Noxious Weed B Spartium junceum Spanish Broom Oregon Noxious Weed B Tamarix ramosissima Tamarisk, Saltcedar Oregon Noxious Weed B Ulex europaeus Gorse Oregon Noxious Weed B Vines and Groundcovers Clematis vitalba Old Man’s Beard Oregon Noxious Weed B Delairea odorata Cape Ivy Oregon Noxious Weed A Hedera helix English Ivy Oregon Noxious Weed B Hedera hibernica Irish Ivy Oregon Noxious Weed B Pueraria lobata Kudzu Oregon Noxious Weed A Tribulus terrestris Puncturevine Oregon Noxious Weed B Perennials and Annuals Aceana novae-zealandiae Biddy-Biddy Oregon Noxious Weed B Acroptilon repens Russian Knapweed Oregon Noxious Weed B Adonis aestivalis Pheasant’s Eye Oregon Noxious Weed B Aegilops cylindrica Jointed Goatgrass Oregon Noxious Weed B Aegilops ovata Ovate Goatgrass Oregon Noxious Weed A Aegilops triuncialis Barbed Goatgrass Oregon Noxious Weed A Alhagi pseudalhagi Camelthorn Oregon Noxious Weed A Alliaria petiolata Garlic Mustard Oregon Noxious Weed B Alyssum corsicum, A. murale Yelllowtuft Oregon Noxious Weed A Amaranthus palmeri Palmer Amaranth Oregon Noxious Weed A Amorpha fruticosa Indigo Bush Oregon Noxious Weed B Anchusa officinalis Common Bugloss Oregon Noxious Weed B Arundo donax Giant Reed Oregon Noxious Weed B Berteroa incana Hoary Alyssum Oregon Noxious Weed A Brachypodium sylvaticum False Brome Oregon Noxious Weed B Bryonia alba White Bryonia Oregon Noxious Weed A Carduus acanthoides Plumeless Thistle Oregon Noxious Weed A Carduus cinereus Turkish Thistle Oregon Noxious Weed A Carduus crispis Welted Thistle Oregon Noxious Weed A Carduus nutans Musk Thistle Oregon Noxious Weed B Carduus pycnocephalus Italian Thistle Oregon Noxious Weed B Carduus tenuiflorus Slender-flowered Thistle Oregon Noxious Weed B Carthamus baeticus Smooth Distaff Thistle Oregon Noxious Weed A Carthamus lanatus Wooly Distaff Thistle Oregon Noxious Weed A Centaurea calcitrapa Purple Starthistle Oregon Noxious Weed A Centaurea cyanus Bachelors Buttons, Cornflower Invasive Plant Centaurea difussa Diffuse Knapweed Oregon Noxious Weed B Centaurea iberica Iberian Starthistle Oregon Noxious Weed A Centaurea macrocephala Bighead Knapweed Invasive Plant Centaurea pratensis Meadow Knapweed Oregon Noxious Weed B Centaurea solstitialis Yellow Starsthistle Oregon Noxious Weed B Centaurea stoebe (C maculosa) Spotted Knapweed Oregon Noxious Weed B Centaurea virgata Squarrose Knapweed Oregon Noxious Weed A Chondrilla juncea Rush Skeletonweed Oregon Noxious Weed B Cirsium arvense Canada Thistle Oregon Noxious Weed B Cirsium vulgare Bull Thistle Oregon Noxious Weed B Conium maculatum Poison Hemlock Oregon Noxious Weed B Convolvulus arvensis Field Bindweed Oregon Noxious Weed B Cortaderia jubata Jubata, Purple Pampasgrass Oregon Noxious Weed B Crupina vulgaris Common Crupina Oregon Noxious Weed B Cuscuta japonica Japanese dodder Oregon Noxious Weed A Cynoglossum officinale Houndstongue Oregon Noxious Weed B Cyperus esculentus Yellow Nutsedge Oregon Noxious Weed B Cyperus rotundas Purple Nutsedge Oregon Noxious Weed A Cytissus scoparius Scotch Broom Oregon Noxious Weed B Ctyissus striatus Portuguese Broom Oregon Noxious Weed B Dispascus laciniatus Cutleaf Teasel Oregon Noxious Weed B Echium pininana Pine Echium Oregon Noxious Weed B Echium plantagineum Paterson’s Curse Oregon Noxious Weed A Echium vulgare Common Viper’s Bugloss Oregon Noxious Weed B Erica lusitanica Spanish Heath Oregon Noxious Weed B Euphorbia esula Leafy Spurge Oregon Noxious Weed B Euphorbia myrsinites Donkey Tail, Myrtle Spurge Oregon Noxious Weed B Euphorbia oblongata Oblong Spurge Oregon Noxious Weed A Fallopia japonica Japanese Knotweed Oregon Noxious Weed B Fallopia sachalinensis Giant Knotweed Oregon Noxious Weed B Fallopia x bohemica Bohemian Knotweed Oregon Noxious Weed B Foeniculum vulgare Fennel Invasive Plant Galega officinalis Goatsrue Oregon Noxious Weed B Genista monspessulana French Broom Oregon Noxious Weed B Geranium lucidum Shiny Leaf Geranium Oregon Noxious Weed B Geranium robertianum Herb Robert, Stinky Bob Oregon Noxious Weed B Halogeton glomeratus Halogeton Oregon Noxious Weed B Heracleum mantegazzianum Giant Hogweed Oregon Noxious Weed A Hieracium aurantiacum Orange Hawkweed Oregon Noxious Weed A Hieracium caespitosum Meadow Hawkweed Oregon Noxious Weed B Hieracium floribundum Yellow Hawkweed Oregon Noxious Weed A Hieracium pilosella Mouse-ear Hawkweed Oregon Noxious Weed A Hieracium piloselloides King-devil Hawkweed Oregon Noxious Weed A Hypericum perforatum Common St. John’s Wort Oregon Noxious Weed B Impatiens glandulifera Policeman’s Helmet, Jewelweed Oregon Noxious Weed B Isatis tinctoria Dyer’s Woad Oregon Noxious Weed B Kochia scoparia Mexican Fireweed Oregon Noxious Weed B Lamiastrum galeobdolon Yellow Archangel Oregon Noxious Weed B Lathyrus latifolius Perennial Peavine Oregon Noxious Weed B Lepidium chalipensis Lens-podded Whitetop Oregon Noxious Weed B Lepidium draba Whitetop, Hoary Cress Oregon Noxious Weed B Lepidium latifolium Perennial Pepperweed Oregon Noxious Weed B Lepidium pubescens Hairy Whitetop Oregon Noxious Weed B Linaria dalmatica Dalmatian Toadflax Oregon Noxious Weed B Linaria vulgaris Yellow Toadflax Oregon Noxious Weed B Lysimachia vulgaris Garden Yellow Loosestrife Oregon Noxious Weed A Lythrum salicaria Purple Loosestrife Oregon Noxious Weed B Nardus stricta Matgrass Oregon Noxious Weed A Onopordum acanthium Scotch Thistle Oregon Noxious Weed B Onopordum tauricum Taurian Thistle Oregon Noxious Weed A Orabanche minor Small Broomrape Oregon Noxious Weed B Peganum harmala African Rue Oregon Noxious Weed A Phlaris arundinacea Ribbongrass, Reed Canarygrass Oregon Noxious Weed B Polygonum polystachyum Himalayan Knotweed Oregon Noxious Weed B Potentilla recta Sulfur Cinquefoil Oregon Noxious Weed B Ranunculus ficaria Lesser Celandine Oregon Noxious Weed B Saccharum ravennae Ravengrass Oregon Noxious Weed A Salvia aethiopis Mediterranean Sage Oregon Noxious Weed B Senecio jaconbaea Tansy Ragwort Oregon Noxious Weed B Silybum marianum Milk Thistle Oregon Noxious Weed B Spartium junceun Spanish Broom Oregon Noxious Weed B Sphaeruphysa salsula Swainsonpea Oregon Noxious Weed B Taeniantherum canput-medusae Medusahead Rye Oregon Noxious Weed B Tussilago farfara Coltsfoot Oregon Noxious Weed A Ulex europaeus Gorse Oregon Noxious Weed B Ventenata dubia Ventenata Grass Oregon Noxious Weed B Aquatic and Wetland Plants Butomus umbellatus Flowering rush Oregon Noxious Weed A Egeria densa(Elodea) South American Waterweed Oregon Noxious Weed B Hydrilla verticillata Hydrilla Oregon Noxious Weed A Hydrocharis morsus-ranae Common Frogbit Oregon Noxious Weed A Iris pseudoacorus Yellow Flag Iris Oregon Noxious Weed B Limnobium laevigatum West Indian Spongeplant Oregon Noxious Weed A Ludwigia grandiflora Large-flower Water Primrose Oregon Noxious Weed B Ludwigia hexapetala Water Primrose Oregon Noxious Weed B Ludwigia peploides Floating Water Primrose Oregon Noxious Weed B Lythrum salicaria Purple Loosestrife Oregon Noxious Weed B Myriophyllum aquaticum Parrot Feather Oregon Noxious Weed B Myriophyllum spicatum Eurasian Watermilfoil Oregon Noxious Weed B Nymphoides peltata Yellow Floating Heart Oregon Noxious Weed A Phragmites australis Common Reed Oregon Noxious Weed B Sagittaria platyphylla Delta Arrowhead Oregon Noxious Weed A Spartina alterniflora Smooth Cordgrass Oregon Noxious Weed A Spartina anglica Common Cordgrass Oregon Noxious Weed A Spartina densiflora Dense-flowered Cordgrass Oregon Noxious Weed A Spartina patens Saltmeadow Cordgrass Oregon Noxious Weed A Stratiotes aloides Water Soldiers Oregon Noxious Weed A Trapa natans European Water Chestnut Oregon Noxious Weed A Common Name Scientific Name Type African Rue Peganum harmala Perennial Alyssum, Hoary Berteroa incana Perennial Amaranth, Palmer Amaranthus palmeri Perennial Archangel, Yellow Lamisatrum galeobdolon Perennial Armenian Blackberry Rubus armeniacus Shrub Arrowhead, Delta Sagittaria platyphylla Aquatic Bechelors Buttons Centaurea cyanus Perennial Biddy-Biddy Aceana novae-zealandiae Perennial Bighead Knapweed Centaurea macrocephala Perennial Bindweed, False Convolvulus arvensis Perennial Blackberry, Armenian Rubus armeniacus Shrub Blackberry, Himalayan Rubus discolor Shrub Blackberry, Himalayan Rubus proderus Shrub Bohemian Knotweed Fallopia x bohemica Perennial Brome, False Brachypokium sylvaticum Perennial Broom, French Genista monspessulana Shrub Broom, Portuguese Cytisus striatus Shrub Broom, Scotch Cytisus scoparius Shrub Broom, Spanish Spartium junceum Perennial Broom, Spanish Spartium junceum Shrub Broomrape, Small Orabanche minor Perennial Bryonia, White Bryonia alba Perennial Bugloss, Common Anchusa officinalis Perennial Bugloss, Common Viper's Echium vulgare Perennial Bull Thistle Cirsium vulgare Perennial Butterfly Bush Buddleia davidii Shrub Butterfly Bush Buddleia variabilis Shrub Camelthorn Alhagi pseudalhagi Perennial Canada Thistle Cirsium arvense Perennial Canarygrass, Reed. Ribbongra Phlaris arundinacea Perennial Cape Ivy Delairea odorage Vine Celedine, Lesser Ranunculus fitaria Perennial Chestnut, European Water Trapa patens Aquatic Cinquefoil, Sulfur Potentilla recta Perennial Coltsfoot Tussilago farfara Perennial Common Bugloss Anchusa officinalis Perennial Common Cordgrass Spartina anglica Aquatic Common Crupina Crupina vulgaris Perennial Common Frogbit Hydrocharis morsus-ranae Aquatic Common Reed Phragmites australis Aquatic Common St. John's Wort Hypericum perforatum Perennial Common Viper's Bugloss Echium vulgare Perennial Cordgrass, Common Spartina anglica Aquatic Cordgrass, Dense Flowered Spartina densiflora Aquatic Cordgrass, Saltmeadow Spartina patens Aquatic Cordgrass, Smooth Spartina alterniflora Aquatic Crupina, Common Crupina vulgaris Perennial Cutleaf Teasel Dispascus laciniatus Perennial Dalmatian Toadflax Linaria dalmatica Perennial Delta Arrowhead Sagittaria platyphylla Aquatic Dense Flowered Cordgrass Spartina densiflora Aquatic Diffuse Knapweed Centaurea difussa Perennial Dodder, Japanese Cuscuta japonica Perennial Dog Rose Rosa canina Shrub Dyer's Woad Isatis tinctoria Perennial Echium, Pine Echium pininana Perennial English Hawthorn Crataegus mongyna Tree English Holly Ilex aquifolium Shrub English Ivy Hedera helix Vine European Water Chestnut Trapa patens Aquatic False Bindweed Convolvulus arvensis Perennial False Brome Brachypokium sylvaticum Perennial Feather, Parrot Myriophyllum aquaticum Aquatic Fennel Foeniculum vulgare Perennial Fireweed, Mexican Kochia scoparia Perennial Flag Iris, Yellow Iris pseudoacorus Aquatic Floating Heart, Yellow Nymphoides peltata Aquatic Floating Water Primrose Ludwigia peploides Aquatic Flowering Rush Butomus umbellatus Aquatic French Broom Genista monspessulana Shrub Frogbit, Common Hydrocharis morsus-ranae Aquatic Garden Yellow Loosestrife Lysimachia vulgaris Perennial Garlic Mustard Alliaria petiolata Perennial Geranium, Shiny Leafed Geranium lucidum Perennial Giant Hogweed Heracleum montegazzianum Perennial Giant Knotweed Fallopia schalinensis Perennial Giant Reed Arundo donax Perennial Goatgrass, Ovate Aegilops ovata Perennial Goatrue Galega officinalis Perennial Gorse Ulex europaeus Perennial Gorse Olex euroaeus Shrub Gorse, Ventenata Ventenata dubia Perennial Hairy Whitetop Lepidium pubescens Perennial Halegeton Halogeton glomeratus Perennial Hawkweed, King-devil Hieracium piloselloides Perennial Hawkweed, Meadow Hieracium caespitosum Perennial Hawkweed, Mouse-ear Hieracium polosella Perennial Hawkweed, Orange Hieracium aurantiscum Perennial Hawkweed, Yellow Hieracium floribundum Perennial Hawthorn, English Crataegus mongyna Tree Heart, Yellow Floating Nymphoides peltata Aquatic Heath, Spanish Erica lusitanica Shrub Hemlock, Poison Conium maculatum Perennial Herb Robert, Stinky Bob Geranium robertianum Perennial Himalayan Blackberry Rubus discolor Shrub Himalayan Blackberry Rubus proderus Shrub Himalayan Knotweed Polygonum polystachyum Perennial Hoary Alyssum Berteroa incana Perennial Hogweed, Giant Heracleum montegazzianum Perennial Holly, English Ilex aquifolium Shrub Houndstongue Cynoglossum officinale Perennial Hydrilla Hydrilla verticillata Aquatic Iberian Starthistle Centaurea iberica Perennial Ify, Cape Delairea odorage Vine Indigo Bush Amporpha fruticosa Perennial Iris, Yellow Flag Iris pseudoacorus Aquatic Irish Ivy Hedera hibernica Vine Ivy, English Hedera helix Vine Ivy, Irish Hedera hibernica Vine Japanese Dodder Cuscuta japonica Perennial Japanese Knotweed Fallopia japonica Perennial Jewelweed, Policeman's Helm. Impatiens glandulifera Perennial Jubata, Purple Pampasgrass Cortaderia jubata Perennial King-devil Hawkweed Hieracium piloselloides Perennial Knapweed, Diffuse Centaurea difussa Perennial Knapweed, Dighead Centaurea macrocephala Perennial Knapweed, Meadow Centaurea pratensis Perennial Knapweed, Russian Acroptilon repens Perennial Knapweed, Spotted Centaurea maculosa Perennial Knapweed, Spotted Centaurea stoebe Perennial Knapweed, Squarrose Centaurea virgata Perennial Knotweed, Bohemian Fallopia x bohemica Perennial Knotweed, Giant Fallopia schalinensis Perennial Knotweed, Himalayan Polygonum polystachyum Perennial Knotweed, Japanese Fallopia japonica Perennial Kudzu Pueraria lobata Vine Large Flowered Water Primro. Ludwigia grandiflora Aquatic Laurel, Spurge Dapphne laureola Shrub Leafy Spurge Euphorbia esula Perennial Lens-podded Whitetop Lepidium chalipensis Perennial Lesser Celedine Ranunculus fitaria Perennial Loosestrife, Garden Yellow Lysimachia vulgaris Perennial Matgrass Nardus stricta Perennial Meadow Hawkweed Hieracium caespitosum Perennial Meadow Knapweed Centaurea pratensis Perennial Mediterrainean Sage Salvia aethiopis Perennial Medusahead Rye Taeniantherum canput-medusae Perennial Mexican Fireweed Kochia scoparia Perennial Milk Thistle Silybum marianum Perennial Mouse-ear Hawkweed Hieracium polosella Perennial Musk Thistle Carduus nutans Perennial Mustard, Garlic Alliaria petiolata Perennial Nutsedge, Purple Cyperus rotundas Perennial Nutsedge, Yellow Cyperus esculentus Perennial Oblong Spurge Euphorbia oblingata Perennial Old Man's Beard Clematis vitalba Vine Orange Hawkweed Hieracium aurantiscum Perennial Ovate Goatgrass Aegilops ovata Perennial Palmer Amaranth Amaranthus palmeri Perennial Pampasgrass, Purple, Jubata Cortaderia jubata Perennial Parrot Feather Myriophyllum aquaticum Aquatic Peavine, Perennial Lathyrus latifolius Perennial Perennial Peavine Lathyrus latifolius Perennial Pheasant's Eye Adonis aestivalis Perennial Pine Echium Echium pininana Perennial Plumeless Thistle Carduus acanthoides Perennial Poison Hemlock Conium maculatum Perennial Policemans Helmet, Jewelweed Impatiens glandulifera Perennial Portuguese Broom Cytisus striatus Shrub Primrose, Floating Water Ludwigia peploides Aquatic Primrose, Large Flowered Wa. Ludwigia grandiflora Aquatic Primrose, Water Ludwigia hexapetala Aquatic Puncture Vine Tribulus terrestris Vine Purple Loosestrife Lythrum salicaria Aquatic Purple Loosestrife Lythrum salicaria Perennial Purple Nutsedge Cyperus rotundas Perennial Purple Starthistle Centaurea calcitrapa Perennial Ragwort, Tansy Senecio jaconbaea Perennial Ravengrass Saccarum ravennae Perennial Reed Canarygrass, Ribbongras Phlaris arundinacea Perennial Reed, Common Phragmites australis Aquatic Reed, Giant Arundo donax Perennial Ribbongrass, Reed Canarygras Phlaris arundinacea Perennial Rose, Dog Rosa canina Shrub Rose, Sweetbriar Rosa rubiginosa Shrub Rue, African Peganum harmala Perennial Russian Knapweed Acroptilon repens Perennial Russian Olive Elaegnus angustifolia Tree Rye, Medusahead Taeniantherum canput-medusae Perennial Sage, Mediterrainean Salvia aethiopis Perennial Saltcedar, Tamarisk Tamarix ramosissima Shrub Saltmeadow Cordgrass Spartina patens Aquatic Scotch Broom Cytisus scoparius Shrub Scotch Thistle Onopordum acanthium Perennial Shiny Leafed Geranium Geranium lucidum Perennial Slender-flowered Thistle Carduus tenuiflorus Perennial Small Broomrape Orabanche minor Perennial Smooth Cordgrass Spartina alterniflora Aquatic Smooth Distaff Thistle Carthamus baeticus Perennial Soldiers, Water Stratiotes aloides Aquatic South American Waterweed Egeria densa Aquatic Spanish Broom Spartium junceum Perennial Spanish Broom Spartium junceum Shrub Spanish Heath Erica lusitanica Shrub Spotted Knapweed Centaurea maculosa Perennial Spotted Knapweed Centaurea stoebe Perennial Sprongeplant, West Indian Limnobium laevigatua Aquatic Spurge Laurel Dapphne laureola Shrub Spurge, Leafy Euphorbia esula Perennial Spurge, Oblong Euphorbia oblingata Perennial Squarrose Knapweed Centaurea virgata Perennial St. John's Wort, Common Hypericum perforatum Perennial Starthistle, Iberian Centaurea iberica Perennial Starthistle, Purple Centaurea calcitrapa Perennial Starthistle, Yellow Centaurea solstitialis Perennial Stinky Bob, Herb Robert Geranium robertianum Perennial Sulfur Cinquefoil Potentilla recta Perennial Swainsonpea Spaeruphysa salsula Perennial Sweetbriar Rose Rosa rubiginosa Shrub Tamarisk, Saltcedar Tamarix ramosissima Shrub Tansy Ragwort Senecio jaconbaea Perennial Taurian Thistle Onopordum tauricum Perennial Teasel, Cutleaf Dispascus laciniatus Perennial Thistle, Bull Cirsium vulgare Perennial Thistle, Canada Cirsium arvense Perennial Thistle, Milk Silybum marianum Perennial Thistle, Musk Carduus nutans Perennial Thistle, Plumeless Carduus acanthoides Perennial Thistle, Scotch Onopordum acanthium Perennial Thistle, Slender-flowered Carduus tenuiflorus Perennial Thistle, Smooth Distaff Carthamus baeticus Perennial Thistle, Taurian Onopordum tauricum Perennial Thistle, Turkish Carduus cinereus Perennial Thistle, Welted Carduus Crispis Perennial Thistle, Wooly Distaff Carthamus lanatus Perennial Toadflax, Dalmation Linaria dalmatica Perennial Tree of Heaven Ailanthus altissima Tree Turkish Thistle Carduus cinereus Perennial Ventenata Grass Ventenata dubia Perennial Viper's Bugloss, Common Echium vulgare Perennial Water Chestnut, European Trapa patens Aquatic Water Primrose Ludwigia hexapetala Aquatic Water Primrose, Floating Ludwigia peploides Aquatic Water Primrose, Large Flowe. Ludwigia grandiflora Aquatic Water Soldiers Stratiotes aloides Aquatic Waterweed, South American Egeria densa Aquatic Welted Thistle Carduus Crispis Perennial West Indian Spongeplant Limnobium laevigatua Aquatic White Bryonia Bryonia alba Perennial Whitetop, Hairy Lepidium pubescens Perennial Whitetop, Lens-podded Lepidium chalipensis Perennial Woad, Dyer's Isatis tinctoria Perennial Wooly Distaff Thistle Carthamus lanatus Perennial Yellow Archangel Lamisatrum galeobdolon Perennial Yellow Flag Iris Iris pseudoacorus Aquatic Yellow Floating Heart Nymphoides peltata Aquatic Yellow Hawkweed Hieracium floribundum Perennial Yellow Loosestrife, Garden Lysimachia vulgaris Perennial Yellow Nutsedge Cyperus esculentus Perennial Yellow Starthistle Centaurea solstitialis Perennial Yellowtuft Alyssum corsicum Perennial
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