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How to Water New Grass Seed

Once sown, grass seed must remain moist to germinate. This is true of all seeds, not just grass, but normally seeds are surrounded by a layer of water-retaining soil. Grass seed sits on the surface of the soil, open to elements such as the sun and wind, which can lead to rapid dehydration. Watering new grass seed is tricky business. Too much water will cause the seeds to rot, while too little will keep the seeds from sprouting. The survival of new grass seeds is dependent on the development of a watering regime that corresponds to the local climate and conditions.

Things You'll Need

  • Garden hose spray nozzle
  • Garden hose
  • Watering can
  • Sprinklers
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Instructions

    • 1

      Connect a garden hose spray nozzle with a "mist" setting to a standard garden hose. Use the hose to distribute a fine sheet of water over the grass seeds of a newly established lawn. Water each section of the lawn for 4 to 5 minutes, or until the top inch of soil is evenly moist.

    • 2

      Repeat this process two to three times a day depending on the weather. On hot, windy days, seeds may need water every few hours to stay moist, though grass seed sown in shady areas will not need as much water as those exposed to full sun. Once the grass is up, reduce the schedule, watering every other day for 10 to 15 minutes until the grass has reached 2 inches in height. At maturity, water grass weekly for 30 minutes at a time.

    • 3

      Fill a watering can and hand-water seeds that you have scattered over bare spots. Water until the surrounding soil is wet, not waterlogged. Repeat the process two times each day until the seeds sprout.

    • 4

      Scatter sprinklers across the yard to water an over-seeded lawn. Normally, it is best to give the grass a thorough soaking once a week. However, to get the new seeds to sprout, you will need to water twice a day. Turn the sprinklers on for 5 to 10 minutes first thing in the morning and once again in the afternoon. When the seed sprouts, reduce the schedule, returning to weekly watering for 20 to 30 minutes.