Brown Knapweed
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.
Bladder Campion
It is native to Europe, where in some parts it is eaten, but is widespread in North America where it is considered a weed. Bladder Campion tea is widely used in folk medicine.
Bull Thistle
Bull thistle is often a transient species, appearing in recent clear-cuts or disturbed areas and becoming a dominant species for several years