Through Aug. 31, landscape watering is prohibited between the hours of 11 a.m. and 7 p.m. when it is most likely to evaporate due to heat. And remember, NEVER water on Sundays! Resist the impulse to crank up landscape watering when temperatures get hotter. Your landscape doesn't need as much water as you might think. While nights are still cool, gradually increase your sprinkler watering from three days to four. From there, keep an eye on your landscape and increase watering only as needed. For plants and trees, we recommend drip watering four days a week. Get more watering tips.