Garlic Mustard has been reported primarily in NE and central Illinois, where it is locally common. In other areas of the state, this plant is apparently less common or absent, however it is rapidly spreading. There is little doubt that it is more common than official records indicate. This plant was introduced into the United States from Eurasia. Habitats include moist to slightly dry deciduous woodlands, woodland borders, semi-shaded areas in gardens and along fence rows, and partially shaded waste areas. This plant rarely strays far from the shade provided by woody vegetation and it is intolerant of regular mowing. At the present time, Garlic Mustard is the worst exotic invader of deciduous woodlands in Illinois as it has the capacity to crowd out and destroy all of the native wildflowers that bloom during the spring. Effective measures of control include pulling the plants by their roots and spraying the foliage with herbicides. Cutting the flowering stalks from their stems is not an adequate method of control because Garlic Mustard is capable of regenerating new flowering stalks from its side stems.