Invasive Species Council of British Columbia
Invasive Plant

Mountain bluet

Centaurea montana

About This Species

Mountain bluet (Perennial cornflower, Montane knapweed) is a popular garden perennial introduced from Europe; however, it easily escapes gardens and invades natural areas. This plant can self-seed, which makes it difficult to control. It also spreads through roots. Mountain bluet is found in meadows, pastures, roadsides and disturbed open areas. Mountain bluet is designated as a Management species by the BC Provincial Priority Invasive Species List. 

How to Identify

Mountain bluet ranges from 30-80 cm in height. Fine hairs cover the stem. 

Flowers are large, bright blue with a ray-like appearance and black fringe at the base and look a lot like knapweed flowers.  

Leaves are 10-30 cm long, lance shaped, with a woolly underside. 


Take Action

Prior to seed production, pulling, cutting, or mowing can be effective. If flowers are present, be sure to properly dispose of plants to ensure no more seeds are dispersed. Try to remove as much of the root as possible to discourage regrowth.



Learn about best practices

A few non-invasive alternatives to plant instead of Mountain bluet include:


Use the app

Observe and report to protect BC’s biodiversity

Report through this website

Use our form to tell us what you’re seeing and where.



Click or drag files to this area to upload. You can upload up to 3 files.
Please include photos of the suspected species to help potential identification by experts.
Please be specific and give us an address if possible.