my fellow americans (and canadians), if you see any of this in woodsy areas, pull it out.
it's good eatin' and all, but it is not a plant native to north america, and can make life difficult for native species.
First-year garlic mustard:
--this is the only time you'd really want to consider eating it, according to
this gal.
If you let it survive over the winter into a second year, it'll look like this:
http://www.nps.gov/plants/alien/fact/alpe1.htm