mulch

Any material used to cover the top layer of soil to protect, insulate, or decorate it, or to discourage weeds or retain moisture.countableuncountable

• An organic mulch is a mulch made of natural substances such as leaves or grass clippings.

To apply mulch.

• Mulch your vegetable garden to retain moisture and keep weeds down.

To turn into mulch.

• I decided to mulch the grass clippings.