Mulch does much more than give the landscape a clean, finished appearance. Mulch insulates the soil helping to provide a buffer from temperature changes. Mulch aids in conserving moisture in the soil by slowing evaporation making more water available for plants. Mulch helps prevent weed growth. At a depth of 75mm or more mulch helps to prevent weeds from sprouting by blacking their growth and access to sunlight. Natural wood mulch can improve the soil. As microbes and insects in the soil breakdown the mulch the by-products are adding back to the soil in the form of organic matter.