Herbal tradition holds hedge mustard tea with honey to be sovereign for hoarsness and laryngitis. Why this should be so is a mystery. The plant contains mustard oil glycosides that should irritate rather than ease inflammation. The seeds also contain other glycosides whose effect, though much weaker, resembles that of digitalis in foxglove: they can cause heart failure. The greens are edible raw or cooked.
Hedge mustard seeds can be toxic, especially to heart patients, if ingested in quantity.