Elegant and colorful, iris are some of the most popular perennials for growing in home gardens and landscapes. Easy to grow, these classic perennials come back year after year. German Iris, sometimes called Bearded Iris, are grown from rhizomes and treasured for their elegant flowers in late spring. Dutch Iris are grown from bulbs and bloom after German Iris. Japanese, Siberian and Louisiana Iris are favorites for planting near water features. In addition to being showy in the garden, iris are also excellent as cut flowers. All iris are sun-lovers and grow best in well-drained soil. When selecting iris bulbs to buy, consider their grow zone, soil requirements, mature height and spread, bloom time and flower color.