Iris Louisiana Ann Chowning adds bright, show-stopping color to moist areas. Native to the wetlands of the southern United States, Iris Louisiana is the ideal choice for water gardens, along the edge of streams or ponds or in other moist areas. A beardless iris with velvety red flowers and deep yellow highlights, it has green, strappy foliage that looks attractive for several months. Although they originated in the Southeast, Iris Louisiana are adaptable to several climates and most are hardy to zone 4. Unlike bearded iris, they prefer moist conditions and usually do best with about an in. of water each week. Most Iris Louisiana bloom in early to midsummer and attract hummingbirds.