Hydroseeding is a non-hazardous, non-toxic, and efficient way of planting and sprouting fresh grass. Hydroseeding is very safe around children and animals because no harsh chemicals are used in the process.  Hydro seeds can go without water for up to a day, but this also depends greatly on weather conditions. Keeping newly planted hydroseed moist is critical for seedlings to germinate and thrive, resulting in a beautiful, green lawn. If the weather is cool and damp, as in the spring, you may not need to water at all or may be able to go a day or two without watering, but you will still need to check the area every day to ensure it is sufficiently moist.