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.

These weeds have been selected as top priority for control. The complete list of Oregon noxious weeds can be found at Oregon Noxious Weeds


T indicates plants targeted for eradication.

Trees
Ailanthus altissima            Tree of Heaven                Oregon Noxious Weed
Crataegus monogyna             Oneseed Hawthorn              Oregon Noxious Weed
Elaeagnus angustifolia         Russian Olive                 Invasive Plant

Shrubs
Buddleia davidii, B variabilis Butterfly Bush                Oregon Noxious Weed
Cytisus scoparius              Scotch Broom                  Oregon Noxious Weed
Cytisus striatus               Portuguese Broom              Oregon Noxious Weed T
Daphne laureola                Spurge Laurel                 Oregon Noxious Weed
Erica lusitanica               Spanish Heath                 Oregon Noxious Weed
Genista monspessulana          French Broom                  Oregon Noxious Weed
Ilex aquifolium                English Holly                 Invasive Plant
Rosa canina                    Dog Rose                      Oregon Noxious Weed
Rosa rubiginosa                Sweetbriar Rose               Oregon Noxious Weed
Rubus armeniacus               Armenian Blackberry           Oregon Noxious Weed
Rubus discolor (R. procerus)   Himalayan Blackberry          Oregon Noxious Weed
Spartium junceum               Spanish Broom                 Oregon Noxious Weed
Tamarix ramosissima            Tamarisk, Saltcedar           Oregon Noxious Weed T
Ulex europaeus                 Gorse                         Oregon Noxious Weed

Groundcovers and Vines
Clematis vitalba               Old Man’s Beard               Oregon Noxious Weed		
Delairea odorata               Cape Ivy                      Oregon Noxious Weed T
Hedera helix                   English Ivy                   Oregon Noxious Weed
Hedera hibernica               Irish Ivy                     Oregon Noxious Weed
Pueraria lobata                Kudzu                         Oregon Noxious Weed T
Tribulus terrestris            Puncturevine                  Oregon Noxious Weed

Annuals and Perennials
Abutilon theophrasti           Velvetleaf                    Oregon Noxious Weed
Aceana novae-zealandiae        Biddy-Biddy                   Oregon Noxious Weed
Acroptilon repens              Russian Knapweed              Oregon Noxious Weed
Adonis aestivalis              Pheasant’s Eye                Oregon Noxious Weed
Aegilops cylindrica            Jointed Goatgrass             Oregon Noxious Weed
Aegilops ovata                 Ovate Goatgrass               Oregon Noxious Weed
Aegilops triuncialis           Barbed Goatgrass              Oregon Noxious Weed T
Alhagi pseudalhagi             Camelthorn                    Oregon Noxious Weed
Alliaria petiolata             Garlic Mustard                Oregon Noxious Weed T
Alyssum corsicum, A. murale    Yelllowtuft                   Oregon Noxious Weed T
Ambrosia artemisifolia         Ragweed                       Oregon Noxious Weed
Amorpha fruticosa              Indigo Bush                   Oregon Noxious Weed
Anchusa officinalis            Common Bugloss                Oregon Noxious Weed T
Arundo donax                   Giant Reed                    Oregon Noxious Weed T
Berteroa incana                Hoary Alyssum                 Oregon Noxious Weed T
Brachypodium sylvaticum        False Brome                   Oregon Noxious Weed
Bryonia alba                   White Bryonia                 Oregon Noxious Weed
Carduus acanthoides            Plumeless Thistle             Oregon Noxious Weed T
Carduus cinereus               Turkish Thistle               Oregon Noxious Weed
Carduus crispis                Welted Thistle                Oregon Noxious Weed T
Carduus nutans                 Musk Thistle                  Oregon Noxious Weed
Carduus pycnocephalus          Italian Thistle               Oregon Noxious Weed
Carduus tenuiflorus            Slender-flowered Thistle      Oregon Noxious Weed
Carthamus baeticus             Smooth Distaff Thistle        Oregon Noxious Weed
Carthamus lanatus              Wooly Distaff Thistle         Oregon Noxious Weed T
Centaurea calcitrapa           Purple Starthistle            Oregon Noxious Weed T
Centaurea cyanus               Bachelors Buttons, Cornflower Invasive Plant
Centaurea difussa              Diffuse Knapweed              Oregon Noxious Weed
Centaurea iberica              Iberian Starthistle           Oregon Noxious Weed T
Centaurea macrocephala         Bighead Knapweed              Invasive Plant
Centaurea pratensis            Meadow Knapweed               Oregon Noxious Weed
Centaurea solstitialis         Yellow Starsthistle           Oregon Noxious Weed
Centaurea stoebe (C maculosa)  Spotted Knapweed              Oregon Noxious Weed T
Centaurea virgata              Squarrose Knapweed            Oregon Noxious Weed T
Chondrilla juncea              Rush Skeletonweed             Oregon Noxious Weed T
Cirsium arvense                Canada Thistle                Oregon Noxious Weed
Cirsium vulgare                Bull Thistle                  Oregon Noxious Weed
Conium maculatum               Poison Hemlock                Oregon Noxious Weed
Convolvulus arvensis           Field Bindweed                Oregon Noxious Weed
Cortaderia jubata              Jubata, Purple Pampasgrass    Oregon Noxious Weed
Crupina vulgaris               Common Crupina                Oregon Noxious Weed
Cuscuta japonica               Japanese Dodder               Oregon Noxious Weed
Cuscuta approximate            Smoothseed alfalfa Dodder     Oregon Noxious Weed
Cuscuta indecora               Bigseed Dodder                Oregon Noxious Weed
Cuscuta pentagona              Five-angled Dodder            Oregon Noxious Weed
Cynoglossum officinale         Houndstongue                  Oregon Noxious Weed		
Cyperus esculentus             Yellow Nutsedge               Oregon Noxious Weed
Cyperus rotundas               Purple Nutsedge               Oregon Noxious Weed
Cytissus scoparius             Scotch Broom                  Oregon Noxious Weed
Ctyissus striatus              Portuguese Broom              Oregon Noxious Weed T
Dispascus laciniatus           Cutleaf Teasel                Oregon Noxious Weed
Echium pininana                Pine Echium                   Oregon Noxious Weed	
Echium plantagineum            Paterson’s Curse              Oregon Noxious Weed T
Echium vulgare                 Common Viper’s Bugloss        Oregon Noxious Weed
Erica lusitanica               Spanish Heath                 Oregon Noxious Weed
Euphorbia esula                Leafy Spurge                  Oregon Noxious Weed T
Euphorbia myrsinites           Donkey Tail, Myrtle Spurge    Oregon Noxious Weed
Euphorbia oblongata            Oblong Spurge                 Oregon Noxious Weed T
Fallopia japonica              Japanese Knotweed             Oregon Noxious Weed
Fallopia sachalinensis         Giant Knotweed                Oregon Noxious Weed
Fallopia x bohemica            Bohemian Knotweed             Oregon Noxious Weed
Foeniculum vulgare             Fennel                        Invasive Plant
Galega officinalis             Goatsrue                      Oregon Noxious Weed T
Genista monspessulana          French Broom                  Oregon Noxious Weed
Geranium lucidum               Shiny Leaf Geranium           Oregon Noxious Weed
Geranium robertianum           Herb Robert, Stinky Bob       Oregon Noxious Weed
Halogeton glomeratus           Halogeton                     Oregon Noxious Weed
Hemizonia pungens              Spikeweed                     Oregon Noxious Weed
Heracleum mantegazzianum       Giant Hogweed                 Oregon Noxious Weed T
Hieracium aurantiacum          Orange Hawkweed               Oregon Noxious Weed
Hieracium floribundum          Yellow Hawkweed               Oregon Noxious Weed
Hieracium pilosella            Mouse-ear Hawkweed            Oregon Noxious Weed
Hieracium piloselloides        King-devil Hawkweed           Oregon Noxious Weed
Hieracium pratense             Meadow Hawkweed               Oregon Noxious Weed
Hypericum perforatum           Common St. John’s Wort        Oregon Noxious Weed
Impatiens glandulifera         Policeman’s Helmet, Jewelweed Oregon Noxious Weed
Isatis tinctoria               Dywer’s Woad                  Oregon Noxious Weed
Kochia scoparia                Mexican Fireweed              Oregon Noxious Weed
Lamiastrum galeobdolon         Yellow Archangel              Oregon Noxious Weed
Lathyrus latifolius            Perennial Peavine             Oregon Noxious Weed
Lepidium chalipensis           Lens-podded Whitetop          Oregon Noxious Weed
Lepidium draba                 Whitetop, Hoary Cress         Oregon Noxious Weed
Lepidium latifolium            Perennial Pepperweed          Oregon Noxious Weed T
Lepidium pubescens             Hairy Whitetop                Oregon Noxious Weed
Linaria dalmatica              Dalmatian Toadflax            Oregon Noxious Weed T
Linaria vulgaris               Yellow Toadflax               Oregon Noxious Weed
Lysimachia vulgaris            Garden Yellow Loosestrife     Oregon Noxious Weed T 
Lythrum salicaria              Purple Loosestrife            Oregon Noxious Weed
Nardus stricta                 Matgrass                      Oregon Noxious Weed T
Onopordum acanthium            Scotch Thistle                Oregon Noxious Weed
Onopordum tauricum             Taurian Thistle               Oregon Noxious Weed T
Orabanche minor                Small Broomrape               Oregon Noxious Weed
Peganum harmala                African Rue                   Oregon Noxious Weed T
Phlaris arundinacea            Ribbongrass, Reed Canarygrass Oregon Noxious Weed T
Pilosella aurantiacum          Orange Hawkweed               Oregon Noxious Weed T
Pilosella caespitosa           Meadow Hawkweed               Oregon Noxious Weed T 
Pilosella floribundum          Yellow Hawkweed               Oregon Noxious Weed T
Pilosella pilosella            Mouse-ear Hawkweed            Oregon Noxious Weed T
Pilosella piloselloides        King Devil Hawkweed           Oregon Noxious Weed
Polygonum cuspidatum           Japanese Knotweed             Oregon Noxious Weed
Polygonum polystachyum         Himalayan Knotweed            Oregon Noxious Weed
Polygonum sachalinense         Giant Knotweed                Oregon Noxious Weed
Potentilla recta               Sulfur Cinquefoil             Oregon Noxious Weed
Ranunculus ficaria             Lesser Celandine              Oregon Noxious Weed
Saccharum ravennae             Ravengrass                    Oregon Noxious Weed T
Salvia aethiopis               Mediterranean Sage            Oregon Noxious Weed
Senecio jaconbaea              Tansy Ragwort                 Oregon Noxious Weed T
Silybum marianum               Milk Thistle                  Oregon Noxious Weed
Solanum elaeagnifolium         Silverleaf Nightshade         Oregon Noxious Weed
Solanum rostratum              Buffalobur                    Oregon Noxious Weed
Sorghum halepense              Johnsongrass                  Oregon Noxious Weed
Spartium junceun               Spanish Broom                 Oregon Noxious Weed
Sphaeruphysa salsula           Swainsonpea                   Oregon Noxious Weed
Taeniantherum canput-medusae   Medusahead Rye                Oregon Noxious Weed
Tussilago farfara              Coltsfoot                     Oregon Noxious Weed
Ulex europaeus                 Gorse                         Oregon Noxious Weed T
Ventenata dubia	               Ventenata Grass               Oregon Noxious Weed
Xanthium spinosum              Spiny Cocklebur               Oregon Noxious Weed
Zygophyllum fabago             Syrian Bean-caper             Oregon Noxious Weed

Aquatic and Wetland Plants
Butomus umbellatus             Flowering rush                Oregon Noxious Weed T
Egeria densa(Elodea)           Brazilian Elodea	             Oregon Noxious Weed
Hydrilla verticillata          Hydrilla                      Oregon Noxious Weed
Hydrocharis morsus-ranae       Common Frogbit                Oregon Noxious Weed
Iris pseudoacorus              Yellow Flag Iris              Oregon Noxious Weed
Limnobium laevigatum           West Indian Spongeplant       Oregon Noxious Weed
Ludwigia grandiflora           Large-flower Water Primrose   Oregon Noxious Weed T
Ludwigia hexapetala            Water Primrose                Oregon Noxious Weed T
Ludwigia peploides             Floating Water Primrose       Oregon Noxious Weed T
Lythrum salicaria              Purple Loosestrife            Oregon Noxious Weed
Myriophyllum aquaticum         Parrot Feather                Oregon Noxious Weed
Myriophyllum spicatum          Eurasian Watermilfoil         Oregon Noxious Weed
Nymphoides peltata             Yellow Floating Heart         Oregon Noxious Weed T
Phragmites australis           Common Reed                   Oregon Noxious Weed
Rorippa sylvestris             Creeping Yellow Cress         Oregon Noxious Weed
Sagittaria platyphylla	       Delta Arrowhead               Oregon Noxious Weed T
Spartina alterniflora          Smooth Cordgrass              Oregon Noxious Weed T
Spartina anglica               Common Cordgrass              Oregon Noxious Weed
Spartina densiflora            Dense-flowered Cordgrass      Oregon Noxious Weed T
Spartina patens	               Saltmeadow Cordgrass          Oregon Noxious Weed T
Stratiotes aloides             Water Soldiers                Oregon Noxious Weed
Trapa natans                   European Water Chestnut       Oregon Noxious Weed

Click on Oregon Noxious Weeds Profiles for pictures and descriptions of noxious weeds. A Listed Weeds are a minor or a potential problem. B Listed Weeds are a more serious problem. T Listed Weeds have been targeted for high priority control.


WARNING!! If you click on a link and a blank screen opens, then connects to a strange website, especially if you see a robot, CLOSE THE NEW WINDOW IMMEDIATELY!! The links will work correctly after the first time.

Home Page
Site Map

Plant Propagation
Planting a Vegetable Garden
Planting in Clay Soil
Preferred Soil pH



hit counter