“What is Mulch?” is a question with several answers. Technically, mulch is any loose substance which is laid over soil as a covering. Mulch can be any number of substances from compost to bark, straw to grass cuttings. There are also a number of reasons why a gardener might use mulch, as the incredibly versatile process of mulching can have all sorts of benefits for the soil and the garden.
At heart, mulching is simple enough (laying down your chosen material over your chosen patch of soil) and is most often employed to benefit the soil in some way, perhaps by helping it retain moisture, fertilise it or protect it from certain hazards.