I love love love this iris garden idea! And we have the perfect place for it! Can't wait to add this beauty's to Casa Johnson's landscaping! Tops the list...after transplanting a bunch of other stuff first of course!
Plant rhizomes 12 to 24 inches apart. Close planting results in immediate effect, faster clump formation, and more color but makes dividing clumps a necessity in two to three years. Plant each of the rhizome "toes" facing inward towards each other.
Plant your rhizomes at or just barely below the surface of the ground. Bearded Irises should be planted so the tops of the rhizomes are visible and the roots are spread out facing downwards in the soil. However, in extremely hot climates or with very light soils, cover rhizomes with up to one inch of soil.