First of all, do not allow the sod to dry out, it will shrink and leave seams. On THE DAY that that the sod is installed, the first watering needs to be extremely heavy, making the sod soggy and puddling has occurred. For sod that has been laid in cool weather, water every 2 to 3 days depending on rainfall. For sod that has been laid in hot, dry weather, water it every day for the first two weeks. The sod should be soggy to the touch. After that, reduce watering to every other day for 2 to 3 weeks. The ground should be soft. After 4 to 5 weeks, water the sod once a week if there has been no rainfall. The best time to water is early morning or early evening. Avoid walking on sod after watering as much as possible, you will leave impressions. When the sod is about 3" high, check for knitting. Knitting is when the sod’s roots take hold to the ground below. You can check for this by gently pulling up a corner of sod. If you cannot pull it up, it has knit. Now it’s time to mow your lawn. Do not water for a few days before mowing and set your mower blade at a high setting.
Seeded areas should be watered two times per day in hot weather and once per day in cool weather. Keep the seeded areas moist and do not allow to dry out. Be cautious not to over-water your lawn (large puddles in the lawn,) or under-water (dried out or cracking). You can mow your lawn around 4 to 5 weeks after germination. Water early in the morning to help your new grass endure the day’s heat. Do not fertilize until the following spring or fall and never over fertilize.