Common Comfrey
It can be found growing in shady, rich soils near riparian areas or in roadside ditches. It primarily reproduces vegetatively and is notoriously difficult to remove due to its tendency to sprout whole plants from small root fragments.
Canada Thistle
Canada thistle is widespread in all areas of BC on roadsides, cultivated fields and pastures, and logged forests and other disturbed areas.
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.
Black Knapweed
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.
Common Burdock
Common burdock is not considered a problem in crops since it is intolerant to cultivation. Livestock are fond of common burdock, and the foliage imparts a bitter taste to the milk if it is eaten in large quantities.