Look for a green color with leaves that dont have blemishes or show any yellowing or withering. Mustard greens should have stems that look freshly cut that arent thick, dried out, browned, or split.
Discard any bruised or yellow leaves and remove any bands or ties that hold bunches together. Gently wrap unwashed mustard greens in paper towels and store loosely in plastic bags. Keep moist and cool in the lower part of the refrigerator in the high-humidity bin. Store for up to five (5) days.