Can a drop of water cause sunburn or fire? Leaves of certain plants are susceptible to leaf burn from too much sun

Why do gardeners say you shouldn't water your plants in the midday sun? Does it really lead to burnt plants or worse? A team of scientists found that water droplets on a smooth surface, such as maple or ginkgo leaves, cannot cause leaf burn. However in contrast the they found that floating fern leaves, which have small wax hairs, are susceptible to leaf burn.

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