New plants have very confined, limited root systems. Until they are established it takes more frequent watering to keep them going in the heat. Over the course of a few months you can gradually back off to less frequent watering. The brown areas will not regreen as these plants can only produce new growth from green, living growth areas.
The initial stress and shock of planting really set your plants back but if the living areas are still fairly well spread throughout the plant it is probably worth leaving them in to see if they can fill back in again over time.
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