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Alliaria petiolata
An abundant invasive "volunteer" at the edge of a wooded lot.
Garlic mustard is considered an exotic invasive in North America. It creates dense stands that crowd out native species and has little value to wildlife. It is, however, quite tasty, although as in the case of any wild plant one should be a bit cautious about eating it in quantity until one knows how he/she reacts to it.