Fresh mint is great to have on hand to dress up a dessert or add a refreshing touch to a beverage. Fortunately, mint is very hardy and will keep for up to a week when stored properly. Cut a small amount from the stem end of a bunch of mint. Then, place the bunch, stems down, in a tall glass and fill with about an inch of cold water. Cover the leaves loosely with a plastic bag and refrigerate until ready to use, changing the water every 2 days.