Iris plants are extremely low maintenance--they require deep watering only when first planted, then normal watering every couple of weeks. If your irises are tall varieties, be sure to stake them to ensure they don't fall over. After they've bloomed, deadhead your irises by removing the faded flowers where they meet the stems. When all flowers have bloomed on a stalk it can be removed by cutting back at the base. About a month after all your irises finish blooming you may apply a low nitrogen, light fertilizer of bone meal, or a 6--10--10 blend and water in.