Watering new seed is one of the most important parts in establishing turf. As little as one hour of drought on a hot, dry day can halt germination. This could mean the yard would need to be replanted. Conversely, over-saturating your mulch leads to mold and can kill your seed base. Therefore, water your mulch lightly several times a day. Watering must be maintained for up to twenty-five (25) days for some varieties of bluegrass. The first grass that shows growth is typically the rye grass variety, not the desirable bluegrass and fescues, so keep watering. Never water just for the sake of watering. Only water when an area is dry.