Hankshaw says: don't wait until a survival situation to eat wild edibles. Get used to preparing and eating them now. Garlic Mustard is a seriously invasive alien plant. Left to itself, it can completely take over an area, crowding out all native plants. Feel free to pull up (and eat) as much of this plant as you can! The crushed plant smells of garlic, hence its name. To prepare Garlic Mustard, simply boil or steam the whole plants (the part that's above ground).