Answer: High temperatures and intense sun create a heavy water demand on plants. Unless that need is met through frequent watering, tender tissue in leafy crops can become scorched. To avoid leaf scorch, reduce the water loss any way you can. Mulch with a three inch deep layer of hay or straw and lay drip irrigation or soaker hoses in your beds of you don't have time to spray them with a hose. Impatiens prefer to grow in the shade, but will tolerate sun if the air temperature is cool. I'd pinch the plants back, removing most of the affected leaves. If all other cultural requirements are met, they should produce healthy new leaves and stems.
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