Initially water is essential to the development of a strong root system in your hydroseeded lawn. Newly hydroseeded lawns should be watered as much as 2-3 times a day. Special care should be taken to ensure that the lawn is NOT saturated during watering and puddles DO NOT form on the lawn. An irrigation system or handheld garden hose is often the best method of watering your lawn. The goal is to have a consistently moist area for the best germination results.