Gardeners know that mulch is a great-looking layer of topping on the soil in gardens and landscapes, but mulch is so much more than just a decorative cover. Mirroring the leaf layer found on a forest floor, mulch covering can benefit both plants and soil.There are many different types of mulch to consider. Some mulch contains leaves and bark that decompose and break down over time, while others contain things like pebbles and shredded tires.Mulch’s benefits run much deeper than beauty.• A mulch layer can moderate the soil temperature reducing the effects of extreme heat or cold.• Soil condition may be improved by the decomposing matter from mulch that provides plants with added nutrition.• Mulching a garden creates the ideal environment for earthworms and beneficial organisms.• If heavy rains or soil erosion is an issue, mulch can help reduce these effects.