In the Garden: Heat, drought and your plants
What do you need to do for plants in the heat?
All of your newly planted trees are going to need some water this summer. Their root systems are very small. Trees need this treatment for the first 2 to 3 years, especially street trees where they may not get the irrigation from your lawn.
These trees need an inch a week - maybe 10 to 15 gallons a week - in the dry season.
It will be worth it in the end: they won't need the water as much after a couple years.