The type of grass you have will determine how much water your lawn requires. Common sprinklers under “normal pressure” will run about 2 hours to put down 1″ of water on a lawn. By the fourth week, you can comfortably water your new lawn once a day every so often. If it goes in easily, don't water. You will need to slowly wean your lawn from daily watering. Water between midnight and sunrise from May to October to minimize water lost to evaporation. Sunshine, temperature and water. The hazards of watering every day lightly. Most established lawns need between one and two inches of water each week to thrive. Most lawns need 1 inch of water per week, either from rain or watering, to soak the soil 6-8 inches deep. If you time the process until there is the required amount of water in the container you’ll know how long to water for. Once the grass is 1 inch tall, water the grass every other day until grass is established (approximately three weeks). However, in this case, you must water new grass seeds twice daily. Here's a test to determine if water is needed : Try pushing the 6" long shaft of a screwdriver into the ground. Another activity that is strictly prohibited is watering the area where the herbicide is administered, at least for a day or two. Sunshine, temperature and water are the main ingredients that boost grass growth, but even with these ingredients, grass can be discredited by adverse or extreme weather conditions that delay or completely prevent its ability to germinate. Watering your lawn without knowing the amount of water your sprinkler uses in an hour can spell doom for you if you release excess water to a small lawn, for instance. The best way to measure this is by putting a straight-sided container on your lawn when you turn the sprinklers on. Generally speaking, lawns with more shade or clay soil don’t need as much water. However, the actual question still remains, How Long to Water Grass Seed With Sprinkler Heads? Finding the best watering regimen for a Saint Augustine lawn is really not difficult. How Much Water Does Your Lawn Need? Monthly Evapotranspiration (inches) 0-1 1 … After two weeks of consistent watering, or until sprouts come up, you should cut back your watering to every other day. If your grass is long and lush, you can try deep soaking. Most oscillating sprinklers will put off about one inch of water an hour. Apply Green-Up Weed & Feed to moist grass because the weed control granules work best when they stick to the weed leaves for a few hours. Once your lawn is established, you may wonder how often to water your grass. Watering 10-15 minutes every day is a terrible start… Your lawn’s root system needs to grow 3 to 4 inches deep to be healthy in the hotter months. To Get Started: Enter your ZIP code in the search bar below. Instead of watering shallowly every day for 15 minutes, water deeply once a week for an hour or so (or how ever long it takes to apply an inch of water). You can avoid runoff in other ways. If not, it may take longer for the grass to grow, or worse, not grow at all. After about two more weeks of watering your lawn every other day, you can continue to cut back to 3 days a week. As of 2014 a cubic metre of water costs £2. The lawn will, however, still need consistent watering the first six months. Simply set out a small container and water until it’s holding one inch. That water can come from rainfall or irrigation. Another way to tell if your lawn is getting enough water is to poke it with a soil sampling tube. On average, most lawns need 1 to 1.5 inches of water per week to stay lush and green. To do this means you need to water deeply and infrequently. Once the grass is established, revert to watering 1-2 times a week for a total of approximately 1 inch of water. 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