How you water your new plants can make all the difference. The best time to water is in the morning hours. The reason for this is less water is lost to evaporation.
Even drought plants need to be watered to be established. You should water new plants for two weeks until they are established. During droughts (except drought tolerant plants) you should water your plants to ensure their survival – not just the new plants but all the plants. Best way to water is to get a nozzle and attach it to your hose and put it on the setting ‘shower’, because you do not want to beat the new plant into the ground by putting it on a hard spray.
You should spray each new plant:
Trees/Larger Bushes = 2 Minutes
Smaller Bushes/Larger Plants = 1 Minute
Small to Medium Plants = 30 Seconds