The Garden Bug: Heat exhaustion

By Brenda Weaver

Plants have different ways to deal with high temperatures. Some plants reduce the leaf area exposed to the sun by curling their leaves. Other plants let their leaves wilt, but as soon as the sun goes behind a cloud or sets in the evening, the leaves quickly recover. Many plants, especially trees, cannot do this, so they move water to as much of the leat as possible, and let the outer edge fend for itself. These edges dry into brown sections known as "summer scorch." Flowering annuals may react to the heat by producing fewer flowers.

Sources: extension.usu.edu, eos.com