Since alfalfa sprouts grow indoors hydroponically (in water), they are available year-round. Sprouts are sold loose, in plastic bags, or in clear plastic boxes making it easy to see and evaluate the quality of the sprouts. They should be moist and crisp, and should look and smell fresh. Avoid sprouts that appear to be slimy, discolored, moldy, or give off a sour smell. Refrigerate sprouts in the container they are packed in or store loosely packed in plastic bags. Sprouts that are tightly packed will be crushed and begin to decay quickly. And don`t wash them before storing. Boxed sprouts will keep for four to five days.