Garlic mustard is a non-native invasive species escaped from gardens: it's everywhere, now. Large areas of central Ohio's Hoover Nature Preserve, Hoover Reservoir, Galena, Ohio are dominated by tall garlic mustard during early spring.
This destructive invasive should be eliminated from wild places. The size of the plants in the picture, with small white flowers, is the ideal size for hand-pulling, roots and all, and bagging for disposal. Before seeds develop, the plants can be composted. Once seeds form, hand-pulled plants must be burned or left in trash bags for landfill disposal to prevent further spreading.