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mulch (n.)

"strawy dung, loose earth, leaves, etc., spread on the ground to protect shoots or newly planted shrubs," 1650s, probably a noun use of Middle English molsh (adj.) "soft, moist" (mid-15c.), from Old English melsc, milisc "mellow, sweet," from Proto-Germanic *mil-sk- (source also of Dutch mals "soft, ripe," Old High German molawen "to become soft," German mollig "soft"), from PIE root *mel- (1) "soft."

mulch (v.)

"to cover with mulch," 1748 (implied in mulched), from mulch (n.). Related: Mulching.

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Definitions of mulch from WordNet
1
mulch (v.)
cover with mulch;
mulch the flowerbeds
2
mulch (n.)
a protective covering of rotting vegetable matter spread to reduce evaporation and soil erosion;
From wordnet.princeton.edu