If you like to cook, you know what great flavor fresh herbs can bring to a dish. But you might also feel discouraged when you only need a small amount of fresh herbs—and waste the rest of an expensive bundle. Growing your favorite herbs in a pot on your kitchen windowsill makes it easy to have fresh herbs on hand easy. Plus, it can be a fun way to try harder-to-find varieties like purple basil, licorice-flavored chervil or herbal-cinnamon shiso. Joining the estimated 14 million U.S. households that tend their own herb gardens will cost, on average, a mere $30 a year.