yellow flowers near a stream

The USDA defines noxious weed plants as “those that can directly or indirectly cause problems for agriculture, natural resources, wildlife, recreation, navigation, public health or the environment.” Also known as nuisance plants, noxious weeds can be invasive or introduced, but they can also be native or non-invasive. Many issues surround these types of plants including prolific seed production and long-term seed bank viability, aggressive germination in disturbed areas, aggressive competition for soil moisture, and increased fuel and fire risk. 

Noxious & Invasive Weeds

Cheat Grass

Bromus tectorum

More information coming soon

Cheatgrass, Chris Evans, University of Illinois, Bugwood.org
Cheatgrass, Chris Evans, University of Illinois, Bugwood.org

Cheatgrass

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Cheatgrass, Tom Heutte, USDA Forest Service, Bugwood.org
Cheatgrass, Tom Heutte, USDA Forest Service, Bugwood.org

Cheatgrass

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Cheatgrass, Chris Evans, University of Illinois, Bugwood.org
Cheatgrass, Chris Evans, University of Illinois, Bugwood.org

Cheatgrass

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Hounds Tongue

Cynoglossum officinale

More information coming soon

Hounds tongue, Mary Ellen (Mel) Harte, Bugwood.org
Hounds tongue, Mary Ellen (Mel) Harte, Bugwood.org

Hounds tongue

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Hounds tongue, Steve Dewey, Utah State University, Bugwood.org
Hounds tongue, Steve Dewey, Utah State University, Bugwood.org

Hounds tongue

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Hounds tongue, Mary Ellen (Mel) Harte, Bugwood.org
Hounds tongue, Mary Ellen (Mel) Harte, Bugwood.org

Hounds tongue

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Prickly Lettuce

More information coming soon

Prickly lettuce, Bruce Ackley, The Ohio State University, Bugwood.org
Prickly lettuce, Bruce Ackley, The Ohio State University, Bugwood.org

Prickly lettuce

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Prickly lettuce, Steve Dewey, Utah State University, Bugwood.org
Prickly lettuce, Steve Dewey, Utah State University, Bugwood.org

Prickly lettuce

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Prickly lettuce, Bruce Ackley, The Ohio State University, Bugwood.org
Prickly lettuce, Bruce Ackley, The Ohio State University, Bugwood.org

Prickly lettuce

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Lactuca serriola

Prickly Russian Thistle

Kali tragus

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Prickly Russian thistle, Howard F. Schwartz, Colorado State University, Bugwood.org
Prickly Russian thistle, Howard F. Schwartz, Colorado State University, Bugwood.org

Prickly Russian thistle

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Prickly Russian thistle, Phil Westra, Colorado State University, Bugwood.org
Prickly Russian thistle, Phil Westra, Colorado State University, Bugwood.org

Prickly Russian thistle

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Prickly Russian thistle, Howard F. Schwartz, Colorado State University, Bugwood.org
Prickly Russian thistle, Howard F. Schwartz, Colorado State University, Bugwood.org

Prickly Russian thistle

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Scotch Broom

Cytisus scoparius

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Scotch broom, Eric Coombs, Oregon Department of Agriculture, Bugwood.org
Scotch broom, Eric Coombs, Oregon Department of Agriculture, Bugwood.org

Scotch broom

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Scotch broom, Eric Coombs, Oregon Department of Agriculture, Bugwood.org
Scotch broom, Eric Coombs, Oregon Department of Agriculture, Bugwood.org

Scotch broom

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Scotch broom, Eric Coombs, Oregon Department of Agriculture, Bugwood.org
Scotch broom, Eric Coombs, Oregon Department of Agriculture, Bugwood.org

Scotch broom

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Scotch Thistle

Onopordum acanthium

More information coming soon

Scotch thistle, L.L. Berry, Bugwood.org
Scotch thistle, L.L. Berry, Bugwood.org

Scotch thistle

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Scotch thistle, L.L. Berry, Bugwood.org
Scotch thistle, L.L. Berry, Bugwood.org

Scotch thistle

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Scotch thistle, L.L. Berry, Bugwood.org
Scotch thistle, L.L. Berry, Bugwood.org

Scotch thistle

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Yellow Starthistle

More information coming soon

Yellow starthistle, Leonard L. Lake, USDA Forest Service, Bugwood.org
Yellow starthistle, Leonard L. Lake, USDA Forest Service, Bugwood.org

Yellow starthistle

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Yellow starthistle, University of Idaho , University of Idaho, Bugwood.org
Yellow starthistle, University of Idaho , University of Idaho, Bugwood.org

Yellow starthistle

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Yellow starthistle, Leonard L. Lake, USDA Forest Service, Bugwood.org
Yellow starthistle, Leonard L. Lake, USDA Forest Service, Bugwood.org

Yellow starthistle

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Centaurea solstitialis