1650s, probably from a noun use of Middle English molsh (adj.) "soft, moist" (early 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."
1802, from mulch (n.). Related: Mulched; mulching.
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