Definition of mulch noun from the Oxford Advanced American Dictionary

 

mulch

 noun
noun
NAmE//mʌltʃ//
 
[countable, uncountable]
 
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material, for example, decaying leaves, that you put around a plant to protect its base and its roots, to improve the quality of the soil, or to stop weeds from growing
See the Oxford Advanced Learner's Dictionary entry: mulch

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