Garlic Mustard is an edible wild plant food. Here is video on how to cook garlic mustard, we made a great pesto recipe. You can forage for the leaves of Garlic Mustard, but you can also eat the flowers and the seeds.
Other names for Garlic Mustard are Jack-by-the-hedge, Poor Man's Mustard, Garlic Root, Hedge Garlic, Jack-in-the-bush, Penny Hedge, Sauce-alone.
Garlic Mustard is a non-native invasive plant, its just plain bad to have it growing in North America. It takes over the growing areas of trilliums, bloodroot, and other slow growing woodland and hedgerow plants, taking up sunlight, nutrients, water. Deer do not eat Garlic Mustard, btw. When you harvest it, be sure to remove the entire plant, including the roots. I bring along a garden trowel or forked digging tool to remove the whole plant and roots.
Garlic Mustard is a biennial, it grows over 2 years, the first year the plant is a low to the ground rosette, the second year the plant grows up and flowers. The leaves are spade shaped with ridges and about 2″ across. After the plant flowers, the seed heads are upright, they look like small string bean pods, about 2″ high and green. You want to remove the plants before they go to seed, as spreading the seed is a bad thing.
Here is a photo of Garlic Mustard: