REPORT

Brown Knapweed

Brown Knapweed

by | Mar 31, 2025

Brown knapweed (Centaurea jacea), an invasive perennial herb native to Europe, is a concern in British Columbia, where it outcompetes native species and reduces biodiversity.

Black Knapweed

Black Knapweed

by | Mar 7, 2025

Black knapweed is a tap-rooted perennial which reproduces by seed primarily, although some lateral sprouting of new stems does occur. In its first year of growth it produces a rosette only and re-grows from the root crown in successive years.