Mulch definitions

mŭlch
A protective covering, usually of organic matter such as leaves, straw, or peat, placed around plants to prevent the evaporation of moisture, the freezing of roots, and the growth of weeds.
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To cover or surround with mulch.
verb
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Leaves, straw, peat moss, etc., spread on the ground around plants to prevent evaporation of water from soil, freezing of roots, etc. and for decoration.
noun
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To apply mulch to.
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(uncountable, agriculture) Shredded vegetable (occasionally mineral) matter used to cover the top layer of soil to protect, insulate, or decorate it, or to discourage weeds or retain moisture.

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

noun
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(countable, agriculture) A material used as mulch, as a decorative redwood bark mulch.
noun
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(agriculture) To apply mulch.

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

verb
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(agriculture) To turn into mulch.

I decided to mulch the grass clippings.

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Origin of mulch

Probably from Middle English melsche, molsh soft from Old English melsc mellow, mild mel-1 in Indo-European roots