Nasturtium is a plant which has edible leaves, flowers, and buds. Young leaves and stems add a peppery accent to salads and sandwiches, or can be used as a substitute for watercress. The flower blossoms may be minced and used to flavor butter, cream cheese, or vinegar and the whole flowers are a colorful and delicious addition to salads or as a garnish. The buds may be used in place of capers. Nasturtiums should be purchased at specialized grocers as those sold in flower shops may have been chemically treated.