When you're caring for your lawn in the spring and summer, there are simple tricks to maximize water efficiency. One easy tip is to avoid turning on sprinklers or watering on windy days; a large majority of the water will be lost to evaporation. Choose when the temperature outside is its coolest -- early morning or late at night -- when the sun won't speed up evaporation. And the best tip? Water your lawn by hand instead of using sprinklers -- this can actually cut your water usage by 50 percent.