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Meadow knapweed
Photo Credit: Eric Coombs, Oregon Department of Agriculture, Retrieved from Bugwood.org (Image Number: 5435713), used under CC BY 3.0 US, modified from the original

Common Name: Meadow Knapweed

Scientific Name: Centaurea x moncktonii

Habitat: grassland, grassland wet, forests - open areas, forests - wet areas, ditches

Provincial Designation: Prohibited Noxious

Prohibited Noxious weeds are plant species that are designated as "prohibited noxious" in the Alberta weed regulation. Prohibited noxious weeds must be destroyed, meaning all growing parts need to be killed or the plant's reproductive mechanisms need to be rendered non-viable.

Origin

Meadow knapweed is native to Europe and was planted in Quebec during the late 1800s to attract honeybees.

Legislated Because

This knapweed can invade grasslands and out-compete important vegetation which reduces the value of pastures, hayfields, and rangeland.

Description

Meadow knapweed is a hybrid of brown knapweed and black knapweed and, as such, shares characteristics of both parent species.

Hybrids are highly variable in appearance. Therefore, several characteristics need to be considered for a clear identification. The flowers usually have large peripheral petals. The bracts are variable in colour but usually have hair-like margins.

The leaves are green, lance-shaped or shallowly lobed, and become progressively smaller as you go up the stem. Meadow knapweed grows up to 150 cm tall.

Learn more about this species:

SeeFact Sheets - Alberta Invasive Species Council

For More Information

Weed Management

Telephone

In Edmonton: 311

Outside Edmonton: 780-442-5311

Email invasiveweeds@edmonton.ca

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