The guidelines below are just that:
guidelines. It is impossible to dictate a watering schedule that will be right for every plant all the time. When deciding how much or how often to water, be sure to allow for weather conditions such as rainfall and the drying effects of high temperatures and wind. Also consider location and plant size. Placement near a building may reflect heat or affect the amount of precipitation received, either of which may mean you need to water more. And generally, the larger the plant, the more water it will need.
The objective with any watering is to get moisture to the roots. Therefore, the best time to water is early morning. Watering later in the day after the sun gets hot increases evaporation (and your water bill), and you risk not delivering enough water to the root system below. Likewise, watering too late in the day may leave exposed areas of a plant too wet overnight, stressing the plant and leaving it more susceptible to foliar fungal diseases. With these precautions in mind, the guidelines below will help you provide the right amount of water to your new garden.
Water your new lawn immediately after installation (within half an hour). Water once or twice daily for the first two weeks until the grass has rooted. Sod should be watered so that the sod strip is wet the entire thickness of the strip, and the soil underneath is moist to a depth of about one inch. The idea is to keep the contact area between the soil and sod strip moist but not saturated. Do not overwater. Saturating the soil below the sod removes oxygen needed for proper root growth.
Make sure you water the entire area of sod; missing a corner can quickly result in dead sod.
After the first two weeks, begin watering less frequently and more deeply until the sod is firmly established. Be sure to avoid heavy traffic of mowing of new sod for the first three weeks following installation. Be sure to avoid heavy traffic or mowing of new sod for the first three weeks following installation.