Because they are fast growing and don’t go dormant after blooming like traditional bearded iris, reblooming bearded iris need regular water and feeding several times throughout the year to keep flowers coming. Low nitrogen fertilizers are best, especially in the heat of summer. Give plants a little now and water in. Rebloomers also appreciate a once-a-week deep watering, supplemented by shallow watering if temperatures soar. Watering in the cool of early evening can help reduce the potential of rhizome rot