TIPS (from the American Water Works Association)
- Water your lawn only when it needs it. A good way to see if your lawn needs watering is to step on the grass. If it springs back up when you move, it doesn't need water. If it stays flat, it's due for a drink. Position sprinklers so water lands on the lawn, not on paved areas.
- Lawns get thirsty and need a drink of water, but too much can drown them. The MN Extension Service recommends 1 inch of water per week.
- Lawns like a leisurely soak only about once a week, not a quick shower. Deep soaking your lawn allows the moisture to soak down to the roots where it will do the most good. A light sprinkling can evaporate quickly and tends to encourage shallow root systems.
- Lawns are early risers. The best time to water them is early in the morning so the blades dry quickly. Evening watering can result in fungal growth and lawn disease. Sprinkling in midday wastes water because it evaporates quickly.
- Give your lawn a haircut, not a scalping. Longer grass blades reduce evaporation. During hot, dry weather, the MN Extension Service suggests setting mower blades at 2.5 to 3 inches.
Minnesota Extension Service Yard & Garden Line (Great tips for maintaining your lawn and garden and much more)