Arugula is perhaps the most popular salad green beyond lettuce, and deservedly so. It's unique flavor is neither mustardy or peppery, but in a category all it's own. Store-bought Arugula will never match the flavor of your own, garden grown, and it is one of the easiest crops imaginable; ideally suited for windowsill, container and small space gardens. Liven up a salad with Arugula's unique flavor, or try it alone and quickly braised. For continuous crops, sow frequently and provide shade in hot weather.