Record 90°F+ heat caused classic heat stress: roots shut down, plant sheds leaves (yellowing, brown tips) to survive. Sprinkler watering twice weekly isn't enough—water daily to 8+ inches deep. Mulch heavily to cool roots. Stop fertilizing—roots can't absorb it, and heat + fertilizer burns.
If heat persists, cut back by one-third to reduce leaf load. The rose won't die but won't recover until temperatures drop.
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