Welcome to the Invasive Species Page

Check out the interactive map for the new invasive plants in your area.

This page features invasive plants that have been flagged as new invaders by one or more Cooperative Weed Management Area belonging to the Northwest Weed Management Partnership. We define "new invaders" to be those plants that exhibit invasive behavior but are still in low enough abundance that, if detected early, can either be contained or eradicated from the Cooperative Weed Management Area where they are listed. (Read the disclaimer)

Find out which plants are listed in your Cooperative Weed Management Area by clicking on the interactive map on the right.

Please help us with early detection and rapid response by looking for and reporting these plants to the Oregon state hotline: 1-866-INVADER

Be aware of the invaders in your area

Browse our Invasives Species List

Palm leaf/Broad leaf Bamboo
*Sasa palmata*

Small Bugloss & Common Bugloss
*Anchusa arvensis & A. officinalis*

Butterfly bush
*Buddleja globosa, davidii*

Chinese silver grass
*Miscanthus sinensis*

Common Reed
*Phragmites australis*

Eurasian watermilfoil
*Myriophyllum spicatum*

European or Woodbine Honeysuckle
*Lonicera periclymenum*

European Plum
*Prunus domestica*

False Brome
*Brachypodium sylvaticum*

Fennel
*Foeniculum vulgare except var. azoricum*

French Broom
*Genista monspessulana = Cytisus monspessulanus*

Giant Hogweed
*Heracleum mantegazzianum*

Giant Reed
*Arundo Donax*

Gorse
*Ulex europaeus*

Harding grass
*Phalaris aquatica*

Hawkweeds
*Hieracium sp.*

Hydrilla
*Hydrilla verticillata*

Italian Arum
*Arum italicum*

Jubata Grass/Pampas Grass
*Cortaderia jubata/Cortaderia selloana*

Knotweeds

Kudzu
*Pueraria lobata*

Lesser Celandine
*Ranunculus ficaria*

Meadow Knapweed
*Centaurea pratensis (C. jacea x C. nigra)*

Parrot Feather Watermilfoil
*Myriophyllum aquaticum*

Paterson's Curse
*Echium plantagineum*

Pokeweed
*Phytolacca americana*

Policeman's Helmet
*Impatiens glandulifera*

Porcelain Berry
*Ampelopsis Brevipedunculata*

Portuguese Broom
*Cytisus striatus*

Purple Loosestrife
*Lythrum salicaria*

Purple/Iberian Starthistle
*Centaurea calcitrapa and C. iberica*

Rush Skeletonweed
*Chondrilla juncea*

Russian Knapweed
*Acroptilon repens*

Shining Geranium
*Geranium lucidum*

Smooth and common cordgrass
*Spartina alterniflora and Spartina anglica*

Spanish Broom
*Spartium junceum*

Spurge laurel
*Daphne laureola*

Sulfur Cinquefoil
*Potentilla recta*

Two-leaf Watermilfoil
*Myriophyllum heterophyllum*

Vochin Knapweed
*Centaurea nigrescens*

Water Primrose
*Ludwigia peploides*

Weeping Sedge
*Carex pendula*

Yellow Flag Iris
*Iris pseudacorus*

Yellow Floating Heart
*Nymphoides peltata*

Yellow Starthistle
*Centaurea solstitialis*

Garlic Mustard
*Allaria Petiolata*

Disclaimer: The purpose of this list is informational and educational and it is neither intended nor approved for use as a regulatory tool. Some of the species on this list are economically important horticultural plants but sometimes cause problems when they escape and establish in natural areas