365/84: 14 May 2010: Jack-by-the Hedge..

…or Garlic Mustard as it’s more often known, is one of those native weeds that has more than a little charm when massed in hedgerows, but which you probably wouldn’t want in your garden. A quick Google suggests that in the US of A that it’s regarded as a pestilence.
For the geeks its Latin name is Alliaria petiolata , and here’s a photo.