Field Guide to Noxious and Other Selected Weeds of British Columbia
Burdock (Arctium species)
Flowerhead bracts with hooked spines
Regional Noxious Weed
biennial weeds common in farmyards, fencelines, roadsides, streambanks and idle areas well known for their rounded flower heads with hooked spines that easily attach to clothing and animals
common burdock (Arctium minus) grows 1 to 3 metres in height; lower leaf stalks are hollow; flower heads are less than 2.5 cm across and scattered along the stems
great burdock, sometimes called giant burdock (Arctium lappa) is similar in appearance but lower leaf stalks are solid and flower heads are over 2.5 cm across and are arranged in a flat-topped cluster rather than along the stem
