mulch, materials put on the vineyard soil surface to assist vine growth. Mulch is useful because it keeps soil damp, stops it getting too hot, and hinders the growth of weeds. They are generally composed of organic matter, providing nutrients for the vine’s growth as the mulch decomposes. Organic mulches have a desirable effect on soil health, by increasing microbial populations and diversity. A common indicator of this is more earthworm activity, related to improved soil structure and better water infiltration.