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Top Invasive Concerns: Noxious Weeds
Top Invasive Concerns: Noxious Weeds
Noxious Weeds

​​​​​​​What are noxious weeds?

Noxious Weeds are terrestrial or aquatic exotic plants that out-compete natives for light, space and nutrients. By displacing native plants, weeds eliminate necessary forage, shelter and habitat for wildlife.

Top concerns:

Meadow Knapweed
Meadow Knapweed (Centaurea pratensis)​​​​
Meadow knapweed is classified as a “List A” species in the Colorado Noxious Weed Act, designating it for statewide eradication. It is a fertile hybrid resulting from crossbreeding black knapweed (C. nigra) and brown knapweed (C. jacea). Learn More.​
Purple Loosestrife
Purple Loosestrife (Lythrum salicaria)​​​​
Purple loosestrife is classified as a “List A” species in the Colorado Noxious Weed Act, designating it for statewide eradication.​​ Learn More.

Yellow Starthistle
Yellow Starthistle (Centaurea solstitialis)
Yellow starthistle is classified as a “List A” species in the Colorado Noxious Weed Act, designating it for statewide eradication.​ ​Learn more​.


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