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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.

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

Shrubs
Buddleia davidii	Butterfly Bush			Oregon Noxious Weed
Buddleia variabilis	Butterfly Bush
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
Geranium lucidum	Shining Geranium
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 for a complete list.

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

More information can be found on my webpages:
Landscape Design | Improving Soil | Plant Nutrients | Planting in Clay Soil | Roses
Edible Landscaping | Fruit Tree Tips | Planting a Vegetable Garden | Lawn Care | Pest Control
Pruning for Shade, Flowers and Fruit | Seasonal Pruning Guide | Remove Trees Roots and All
Fall Planting | Water Wise Gardening | Winter Plant Protection | Oregon Invasive Plants
Oregon Native Landscape Plants | House Plants | Plant Propagation

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