As a rule of thumb, a lawn needs about 1 inch of water per week - including any rainwater, so do not forget to account for that. An easy way to determine how long to water your lawn is by doing the Tin Can Test. Simply place an old tin can under the sprinkler and monitor how long it takes for it to collect 1/4 inch. Using that time, multiply it by four (4) and that will be the time required to sufficiently water your lawn each week. Using your best judgment, monitor your lawn and pull out the sprinklers (or pray for rain) when the lawn is looking a little dry. There are consequences if a lawn is not watered during dry spells. Lack of sufficient water can create stress on the lawn and can also weaken its natural defenses against weeds, insect pests and diseases. The worst case scenario is that lack of water during extreme weather can have such an adverse affect that the grass could ultimately die.
An inherent lawn-survival mechanism kicks in during the summer, where lawns can go dormant. If your lawn goes dormant, water deeply once a month during the dry season (usually during the middle of summer) to put the lawn in the best position to withstand and survive the dry spell.
WATERING AFTER FERTILIZATION
A thorough watering is highly recommended after each BlueFox fertilization treatment. Once applied, fertilizer typically sits on the top surface of the lawn where it has no effect. A good watering will move the fertilizer down to the soil where it can do its magic and provide the root system with much-needed nutrients. Ensure that the fertilizer is distributed evenly on the soil by completely watering all areas that is fertilized - you will avoid having patchy sections in your lawn because of uneven amounts of fertilizer be absorbed into the soil.
The best time to water is in the morning - there is less chance of being windy, which could adversely affect the ability to evenly distribute water and there will be more than sufficient time for the water to be absorbed and the grass to dry before the evening. Grass that remains wet through the night increases the chance of lawn diseases.