Other forms: mulching; mulched; mulches
In a garden or on a farm, mulch is an insulating and protective material that's spread over the soil. Mulch is made of organic stuff like bark or leaves.
Mulch is almost magical in a flower or vegetable garden, keeping plants warm enough during the winter and cool enough during the summer. Mulch also suppresses the growth of weeds and encourages earthworms to burrow in the soil, which helps keep plants healthy. It also keeps the earth moist, by blocking some rainwater from evaporating. The word mulch comes from the Old English molsh, "soft and moist."