Irises are hardy, easy to grow plants with attractive foliage and spectacular flowers - good for every garden design. These flowers need at least a half day of sun and thrive in most climates. In extremely hot climates, some shade is more beneficial, however, irises do better with at least 6 hours of full sun a day. Iris should be planted so the tops of the rhizomes are exposed and the roots are spread out facing downward in the soil.