A layer of mulch insulates the soil and roots from these fluctuations and from extreme summer and winter temperatures. Soils cooled in summer by a layer of mulch attracts earthworms closer to the surface, improving soil structure. Since some mulches may affect soil acidity, a soil sample sent to the County Extension office will help determine soil amendment needs. Mulch retains soil moisture by decreasing evaporation. Also, soils enriched by decomposing organic mulches are able to hold more water.
Personal tastes vary on which mulches are attractive.
This also eliminates weeds, which compete for water and nutrients. Types of Mulches Many types of mulches are available in this area for your use. Leaves are available in most backyards and are much better off mulching a flowerbed than taking space in a landfill. A shredder is an excellent way to convert leaves and small branches into mulch. Rigid, curly oak leaves make good mulch, but flat leaves, like those from maples, form a slick mat that won't let water penetrate into the soil.