How does mulch help in temperature regulation of the soil?

Mulch plays a crucial role in temperature regulation of the soil primarily by acting as an insulating layer. When applied to the surface of the soil, mulch helps to maintain more consistent soil temperatures throughout the changing seasons.

In the summertime, mulch protects the soil from direct sunlight, thereby reducing soil temperature and minimizing evaporation of moisture. This cooling effect is beneficial in preventing stress on plants during hot weather. Conversely, in the winter, mulch provides insulation that helps to retain heat in the soil, which can protect plant roots from freezing temperatures and allow them to survive better through the colder months.

The insulating properties of mulch serve to moderate temperature fluctuations, making the environment more stable and conducive for plant growth. Thus, the correct choice emphasizes the dual function of mulch in both cooler and warmer seasons, demonstrating its effectiveness in enhancing soil health and promoting plant vigor.