1869 10 July 436/1 I find that this leaf mulch will prevent winter killing.
1957 38 536/1 The maximum number of such ants apparently occurs when the topsoil is high in humus and well covered with leaf-mulch.
2014 C. Bramley iii. 24 On no account did I want to get embroiled in some ardent gardeners' discussion about the merits of manure versus leaf mulch.