Invasive Species Council of Manitoba

Diffuse Knapweed

Diffuse Knapweed Centaurea diffusa

Family: Asteraceae

This invasive plant can be found in Manitoba, but its extend is minimal. The largest infestations have been found south-west of Morden. This invasive weed is not wide-spread and there is an opportunity to stop it in its tracks.

Flowers: white or sometimes purple, with small, sharp, rigid spines on the bracts.

Leaves: Leaves are alternate and divdided. They are hairy andÂ greyish-green in colour.

Stems: many branches growing from a single upright stem, ItÂ can grow toÂ 0.3-0.6m in height

Root: a taproot

Do you think you have spotted this Knapweed? Please report sightings to ISCM at (204) 232-6021 or online: report a sighting.

Resources

Diffuse Knapweed ISCM Fact Sheet

Alberta Invasive Plant Council Fact Sheet

2011 Rural Municipality Distribution Map

2010 Rural Municipality Distribution Map

Diffuse Knapweed MWSA 2009Â Survey Map

Information provided courtesy of the Invasive Plants Council of B.C.

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Invasive Species Council of Manitoba

Diffuse Knapweed

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