Invasive non-native plants

The following plants, should not be planted in or near streams or wetlands as they have the potential to completely dominate all native plants.

If possible, existing stands of invasive plants in stream corridors and wetlands should be removed and replaced with native plants that can be found in our Native Plant Finder.

Learn more about invasive species

Report invasive species on the Oregon Invasive Species Hotline.

Picture Common Name Scientific Name
Scotch Broom Cytisus scoparius
Tall Fescue Festuca arundinacea
English Ivy* Hedera helix and Hedera sps.
Himalayan Blackberry Rubus armeniacus
English Holly Ilex aquifolium
Yellow Water Iris Iris pseudacorus
Japanese Knotweed Polygonum cuspidatum
Giant Knotweed* Polygonum sachalinense
Purple Loosestrife* Lythrum salicaria
Bird’s Foot Treefoil Lotus corniculatus
Reed Canarygrass Phalaris arundinacea
English Laurel Prunus laurocerasus
Periwinkle Vinca minor, V. major
Bamboo Several genera
Traveler's Joy Clematis vitalba
Nightshade Solanum dulcamara
Field Bindweed Convolvulus arvensis
Common Teasel Dispacus l.
Canadian Thistle Cirsium arvense
Giant Hogweed Heracleum mantegazzianum
Garlic mustard* Allaria petiolata
Single-seed Hawthorne Crataegus monogyna
Spotted Knapweed Centaurea maculosa
Butterfly Bush* Buddleia davidii

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