They will never grow a thing. Condition the soil with mulch or compost before planting grass or flower beds so that water will soak in rather then run off. Fertilize lawns at least twice a year for root stimulation, but do not over-fertilize. Grass with a good root system makes better use of less water and is more drought-tolerant. Do not scalp lawns when mowing during hot weather.
Taller grass holds moisture better.
A better looking lawn will result. Use water-wise plants. Learn what types of grass, shrubbery, and plants do best in the area and in which parts of the lawn, and then plant accordingly. Choose plants that have low water requirements, are drought-tolerant, and are adopted to the area of the state where they are to be planted. Consider decorating some areas of the lawn with wood chips, rocks, gravel, or other materials now available that require no water at all.