Thanks for updating with your location, Melissa. You are in a difficult situation for sure. The first thing I would try to do is moderate that west sun on the plants. Here at my home, when the ambient temperature is 90F at 6:00 PM, the temperature, according to my digital sensor hanging on a brick wall facing west, reads 120F. That's what kills plants quickly. Some shade is badly needed. With your hot, dry conditions, more frequent watering will be necessary. How and when I water does not relate to your conditions.
