Invasive Species Council of Manitoba

Spotted Knapweed

Centaurea stoebe L.
Family: Asteraceae

This invasive plant has already established itself in the western provinces of Canada and has now been found in localized areas in Manitoba. Â By 2010, patches have been found in roadsides south of Beausejour, in roadsides and a gravel pit north of Sprague, in Birds Hill Provincial Park in the tall grass prairie area. Â Â In 2013, spotted knapweed sightings were found occurred west of Winnipeg, Brandon, Griswold and Deloraine.

Identifying Spotted Knapweed:

Flowers: Spotted Knapweed flowers from June to October.They can beÂ purple or pink and bear stiff bracts which are black tipped giving it a spotted appearance.

Leaves: Basal leaves are deeply lobed and arranged in a rosette. The stem leaves are alternately arranged, small and simple.

Stems: They are stiff and upright. Plants can bear many branches while others may only have one unbranched stem.

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

Resources

Spotted Knapweed ISCM Fact Sheet

Alberta Invasive Plant Council Fact Sheet

2011 Rural Municipality Distribution Map

Spotted Knapweed MWSA 2009 Survey Map

Back to Terrestrial Invasive Species List

Invasive Species Council of Manitoba

Spotted Knapweed

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