How do I get rid of common burdock weeds?
Burdock is fairly easy to control because it reproduces only by seed, and take two years to become a mature plant (biennial). The first year, low-growing plants called rosettes are produced from seed. To control the plants at this point, an application of herbicide is probably easier than digging out the deep taproot. In lawns, selective spot applications of 2,4-D or dicamba to rosettes and second year plants prior to flowering usually provides good results. Products containing glyphosate and glufosinate ammonium are effective but are non-selective herbicides that will kill any plant they come in contact with so don’t use them on grass, trees, or shrubs. Check the plant periodically in case regrowth is occurring from the roots. Herbicide control of burdock is most effective on the first-year rosettes. To control mature plants, cut them down before flowers and burs are formed. This will prevent new seeds from being produced. If burs are already formed, bag and dispose of the cut plants or burn them if possible. Read more about burdock and control on this University of Minnesota Extension publication: http://www.extension.umn.edu/garden/diagnose/weed/broadleaf/basal/cburdock.html