Invasive Species Council of Manitoba

Russian Knapweed

Centaurea repens

Russian Knapweed is a long-lived perennial originating from Eurasia. It forms rosettes in the spring and a flower bolt in early summer.

Although it produces seeds it reproduces mainly by a spreading root system which forms dense clone patches. The roots produce a herbicidal substance that prevents the growth of other plants, it also produces a compound that is poisonous to horses if they consume large quantities .

It can thrive in any soil but is intolerant of shade, prolonged drought and wet areas.

Branching stems can be a meter tall and covered in soft hairs. Leaves are alternate and attach directly at the stem. Flowers are pink-purple with green bracts.

Information provided byÂ Alberta Invasive Plant Council

Resources

2011 Rural Municipality Distribution Map

2010 Rural Municipality Distribution Map

Alberta Invasive Plant Council Fact Sheet

Back to Terrestrial Invasive Species List

Invasive Species Council of Manitoba

Russian Knapweed

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