how do you get Iris to bloom
4. Water irises every week after planting and during the first spring and summer. Also water irises after flowering each spring. If your irises are rebloomers, continue to water through summer if rain is lacking, until they bloom again.Other than that, irises usually do not need water unless there is a drought.. Water irises every week after planting and during the first spring and summer. Also water irises after flowering each spring. If your irises are rebloomers, continue to water through summer if rain is lacking, until they bloom again.