If bad enough, drought stress can kill a new tree, but don’t panic at the first sight of brown leaves. Good news is, if caught in time your tree can recover. If you suspect drought stress e.g. sudden browning of leaves or some leaves are outright falling off, increase your watering and be patient. Your tree will look stressed for a while, but in time, they can re-leaf. (Sometimes, they won’t re-leaf right away, but might come back the next year, looking just fine.)
So, get out there and check the moisture levels on your trees and increase the amount of water you are putting on them, and prepare for the heat!
Horticulturist, Bentley Ridge Tree Farm