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Garlic mustard Mustard Family Alliaria petiolata Key identifying traits Flowers are small, white, and have 4 petals Plants grow to 4’ & typically have one flowering stalk In the early spring roots and new leaves smell like garlic The root usually has a distinct “S” or “L” shape just below the stem Rosettes have kidney shaped leaves while the mature leaves are triangular and sharply toothed All images ©Chris Evans, University of Georgia, www.forestryimages.org Biology and ecology A biennial herb reproducing from seed Garlic mustard is native to Europe and more common in Northern Europe In WA state it is found only in King County and one roadside site in Snohomish County It has been used in salads and as a garlic or onion substitute for recipes; it is high in Vitamins A & C; also contains antiseptic properties & was used to clean wounds Control Prevention – Learn to identify plants; start monitoring early in the season; do not allow plants to produce seed Biological – There are several potential biological control agents Cultural – Plant competitive cover crop Mechanical – Hand pulling is very effective for small infestations although rosettes will tend to break off; tillage can be effective while mowing is not as it can stimulate crown growth and side roots Chemical – Herbicides will be the most effective on rosettes; glyphosate has produced good control while 2,4-D does not significantly control it; the PNW Weed Management handbook does not have specific chemical recommendations for garlic mustard at this time Where found – Not known to be in Stevens County at this time Stevens County Noxious Weed Control Board, February 2007