The continued heat and drought conditions have put stress on most plants, trees and shrubs. It is so IMPORTANT that you are watering properly. Here are three good articles on proper watering techniques. Also, with hanging baskets be sure to water until the water starts to run out the bottom of the basket. If your basket has dried out, you will need to put it in a kiddie pool or larger bucket with water and let the basket gradually soak up the water. Once the peat in the soil shrinks, it takes time for it to gain moisture and expand to the pot again.
Stay cool and keep those plants, trees and shrubs watered!!