Answer: Cherri Berri pyracantha prefers well drained soil, full sun, and tolerates hot, dry areas so I'm perplexed. Perhaps the reflected heat from the wall is just too much for them. If you have the room, you might try moving them forward of the wall by another foot or two. This might be just enough room to keep them from baking while they are young and thin. As they grow thicker and more mature, they should not be so susceptible to leaf burn.
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