Oregon Invasive Weeds

by Rod Smith

Former Iowa Certified Nurseryman and Oregon Certified Nursery Professional

© 2008-2023 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

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

Shrubs
Buddleia davidii	Butterfly Bush			Oregon Noxious Weed
Buddleia variabilis	Butterfly Bush			Oregon Noxious Weed
Cytisus scoparius	Scotch Broom			Oregon Noxious Weed
Cytisus striatus	Portuguese Broom		Oregon Noxious Weed
Daphne laureola		Spurge Laurel 			Oregon Noxious Weed
Genista monspessulana	French Broom			Oregon Noxious Weed
Ilex aquifolium		English Holly			Oregon Noxious Weed
Polygonum cuspidatum	Japanese Knotweed		Oregon Noxious Weed
Polygonum sachalinense	Giant Knotweed			Oregon Noxious Weed
Polygonum polystchyum	Himalayan Knotweed		Oregon Noxious Weed
Rubus armeniacus	Armenian Blackberry		Oregon Noxious Weed
Rubus discolor		Himalayan Blackberry		Oregon Noxious Weed
Rubus procerus		Himalayan Blackberry		Oregon Noxious Weed
Spartium junceum	Spanish Broom			Oregon Noxious Weed
Tamarix ramosissima	Tamarisk, Salt Cedar		Oregon Noxious Weed
Ulex europaeus		Gorse				Oregon Noxious Weed

Groundcovers and Vines
Clematis vitalba	Old Man's Beard			Oregon Noxious Weed
Hedera helix		English Ivy			Oregon Noxious Weed
Hedera hibernica	Irish Ivy		        Oregon Noxious Weed 

Annuals and Perennials
Centaurea cyanus	Bachelor's Buttons, Cornflower	 Oregon Noxious Weed
Centaurea macrocephala	Bighead Knapweed		 Oregon Noxious Weed
Centaurea pratensis	Meadow Knapweed		         Oregon Noxious Weed
Cortaderia jubata	Jubata Grass, Purple Pampasgrass Oregon Noxious Weed
Euphorbia esula		Leafy Spurge			 Oregon Noxious Weed
Euphorbia myrsinites	Myrtle Spurge			 Oregon Noxious Weed
Foeniculum vulgare	Fennel
Geranium robertianum	Herb Robert, Stinky Bob		Oregon Noxious Weed
Geranium lucidum	Shining Geranium		Oregon Noxious Weed
Hieracium floribundum	Yellow Hawkweed		        Oregon Noxious Weed
Hieracium aurantiacum	Orange Hawkweed		        Oregon Noxious Weed
Impatiens glandulifera	Policeman's Helmet, Jewelweed	Oregon Noxious Weed
Linaria dalmatica	Dalmatian Toadflax		Oregon Noxious Weed
Linaria vulgaris	Yellow Toadflax			Oregon Noxious Weed
Lythrum salicaria	Purple Loosestrife		Oregon Noxious Weed
Phlaris arundinacea	Ribbongrass, Reed Canarygrass

Aquatic and Wetland Plants
Egeria densa		Brazilian Elodea		Oregon Noxious Weed
Iris pseudoacorus	Yellow Flag Iris	        Oregon Noxious Weed
Lythrum salicaria	Purple Loosestrife		Oregon Noxious Weed
Myriophyllum aquaticum	Parrot Feather			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.

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



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