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GREATjU RIVERlRIPW GREENING including forbs, grasses, sedges and woody species. Triclopyr, a broadleaf specific herbicide can be used to control garlic mustard when native species are dormant or when garlic mustard is growing amongst grasses and sedges. Monitoring and follow-up treatment will be necessary. Long-term Management Because garlic mustard is such a prolific seed producer and because the seed is readily transported in soil from neighboring populations, it is likely that seedlings will appear for many years in areas that have previously been treated. Monitoring and follow-up treatment will be needed annually. Garlic Mustard April May June July Aug Sept Oct Nov Dec - Mar Burn Foliar Herbicide Cut Stem Herbicide Mow Don't mow Flowering Common Burdock (Arctium minus) Description Burdock is a biennial native to Europe. In the plant's first year, it forms a rosette, similar in appearance to rhubarb. The rosette can reach 3 feet across, with large, heart -shaped leaves. In its second year, the plant develops a branched, 3- to 7-foot tall hollow stem. The grooved stem can be green or reddish - purple in color, with tapered leaves along its length. Leaves are dark green, coarse -textured above and woolly beneath, with wavy margins. The plant arises from a large, fleshy taproot. Flowering occurs from July until frost. The pink to purple flowers of this member of the Aster Family occur in heads that are about % inch wide. The thistle -like flower heads are surrounded by spiny bracts with hooks at the tip. Flowers heads are clustered at the ends of branches and in leaf axils along the stem. The mature flower heads become burs that facilitate seed dispersal by clinging to clothing and hair. A single plant produces an average of 15,000 seeds. Common burdock occurs along roadsides and ditch banks, as well as in pastures and other disturbed areas, where the plant effectively outcompetes desirable species by shading them out with its large basal leaves. Burdock generally prefers moist, nitrogen -rich soils, but will grow in a variety of soils. Mechanical Cultivation can be used to control small plants. For larger plants, the entire plant needs to be removed which can be challenging because of the long taproot. Severing the tap root as deep as possible with a shovel or parsnip predator can knock the plant back, if not kill it completely. Mowing the rosette or lopping the flowering stalk when it is in bud or recently flowered will prevent the plant from seeding or at least significantly reduce the amount of seed the plant produces. Mowing the plant when it begins to bolt (send up a flower stalk) will allow time for a second mow later in the year to control any resprouts.