Garlic mustard, a Class A noxious weed, is a biennial or winter annual herb that generally grows 2-3 (up to 6) feet tall. Lower leaves are kidney-shaped with scalloped edges. Leaves feel hairless, and the root has an "S" or "L" shape just below the stem base.
Garlic mustard forms dense monocultures that reduce the biodiversity and aesthetic value of natural areas. The effects of garlic mustard on ecosystems are long-lasting and may permanently alter forests, even after removal. It releases allelopathic chemicals that change soil chemistry and prevent growth of other plants.
https://www.ontarioinvasiveplants.ca/wp-content/uploads/2016/07/OIPC_BMP_GarlicMustard.pdf
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