I. mulch 1 /mʌltʃ/ BrE AmE noun [countable usually singular, uncountable]
[ Date: 1600-1700 ; Origin: Probably from melch 'soft' (14-19 centuries) ]
a substance such as decaying leaves that you put on the soil to improve its quality, to protect the roots of plants, or to stop ↑ weed s growing
II. mulch 2 BrE AmE verb [intransitive and transitive]
to cover the ground with mulch