Wild mustard

The leaves of Wild Mustard are edible at the juvenile stage of the plant. In animals, except birds, the seeds are toxic and cause gastrointestinal problems, especially if consumed in large quantities. Once the seeds are ground, they produce a kind of mustard. A native of the Mediterranean basin, it is widespread in all temperate regions of the planet. It has also become naturalized throughout much of North America. It is a highly invasive species.