Too much fertilizer will lead to excessive growth, which will then require more watering. If the grass clippings are left on the lawn, little, if any, additional fertilizer will be needed. Grass with a good root system makes better use of less water and is more drought tolerant. Use mulches in flower and shrub beds. Mulches cover and shades soil, minimize evaporation, reduce weed growth, and slow erosion.
Mulches can also add a decorative appearance to the landscape.