mulch

US /mʌltʃ/
UK /mʌltʃ/
"mulch" picture
1.

a material (such as decaying leaves, bark, or compost) spread around or over a plant to enrich or insulate the soil.

:
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Spread a thick layer of wood chip mulch around the base of the trees.
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Compost can be used as an excellent organic mulch.
:
composthumustopsoilfertilizermanure
1.

to apply mulch to (soil or plants).

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It's best to mulch the garden beds in spring and fall.
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We need to mulch the new rose bushes to protect them from frost.
:
coverspreadlayerdress