Bottlebrush shrubs are dying

We have three bottlebrush shrubs on the north side of our house, used for privacy. They are watered by irrigation system. Planted three years ago, now about seven feet tall. Two became sparse, brownish and scraggly. It's been extremely hot here. Watering restricted to once a week; mid. to 8am & 6 pm to mid; 40 minutes a section. Can we do anything to save these shrubs? Thank you.
Submitted by BHGPhotoContest

Common bottlebrush (Callistemon citrinus) usually doesn't need much water, and yours are certainly established in their spot. You can try cutting them back hard to get rid of the scraggly look. Most tough plants like bottlebrush will take it as a dare and come back stronger and more lush than ever.

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