Mulch, at its simplest, is a layer of material around the base of plants, which may be either organic or inorganic. In this context, organic is not used in the Soil Association sense to mean ‘without chemicals’, it simply means made of carbon-based material such as wood chip, bark chippings or compost. Inorganic, then, means made from stone, glass or anything else not carbon-based. A mulch can be as simple as a layer of pretty stones or glass pebbles on the top of a flower pot, around the base of the plant it contains, or as complicated as covering all the exposed ground around all the shrubs in your garden with bark chippings.
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