Iris Caesar's Brother features flowers of intense, rich purple-blue, atop blue-green foliage. Although it prefers rich, moist soil, its deep roots allow it to thrive even in more challenging locations with poor, dry soil. That deep root system also makes Caesar's Brother a good choice for control of soil erosion and for difficult embankments. Great for cutting. One of the oldest cultivars and still one of the best. Missouri Botanical Garden, Plant of Merit. Recipient of the Morgan Award, the highest award for Siberian Iris given by the American Iris Society.