The leaves are edible and can be used in salads. The roots can also be eaten as you would horseradish.
Garlic mustard is the larval food plant of the Orange-tip butterfly particularly on damper more open sites such as riverbanks. The orange eggs are laid just behind the flower. It is also the food plant for the caterpillars of green-veined whites. Garlic mustard seeds are also eaten by birds.