When water is in short supply, provide a little help. Use Ground Cover. Some ground covers such as vinca, pachysandra or moss are an attractive alternative to grass in low light areas. Proper pruning will benefit your trees and the turf growing beneath them. Plant Shade Grasses.
Grasses vary greatly in their tolerance to shade.
Choose the best low light varieties. Proper fertility levels will benefit both your lawn and trees. Just as in medicine, the complexity of landscape management has grown greatly in recent years. A thorough understanding of the plants involved, the limited resources, and the design goals of the landscape are essential. If all of this seems a bit overwhelming, you can always contact a professional who takes a holistic perspective and considers the delicate balance required for trees and lawns to live together in harmony.