Oregon Invasive Weeds

Oregon Invasive Weeds

by Rod Smith

Former Iowa Certified Nurseryman and
Oregon Certified Nursery Professional

© 2008-2024 Rodney A. Smith
All rights reserved.

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.

The list of Oregon noxious weeds arranged by common names can be found at Oregon Noxious Weeds


 
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
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

Groundcovers and Vines
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

Annuals and Perennials
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

Click on Oregon Noxious Weeds Profiles for pictures and descriptions of noxious weeds.


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