Answer: Reddening and dieback is often a cause of drought stress but this would be unusual for established plants unless they have suffered some type of root disturbance. It could also possibly be caused by accidental herbicide drift or a similar physical cause such as being repeatedly hit with a basketball, for example. There are few typical problems although scale insects (would be little bumps or flat disks attached to the foliage and stems) and fungal infections do occasionally occur, but they would not necessarily cause reddening as you describe. You might inspect the plants carefully and possibly consult with your county extension (737-1178) for a more specific diagnosis and suggested steps to take care of the problem. I'm sorry I can't be more helpful.
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