名詞 mulch:

1. a protective covering of rotting vegetable matter spread to reduce evaporation and soil erosion

動詞 mulch:

1. cover with mulch

mulch

n.（名詞）
A protective covering, usually of organic matter such as leaves, straw, or peat, placed around plants to prevent the evaporation of moisture, the freezing of roots, and the growth of weeds.
覆蓋層：放在植物周圍以防止水份蒸發(fā)、根被凍壞和野草生長的保護性覆蓋物，通常由有機物質(zhì)構成，如樹葉、草或泥炭等
v.tr.（及物動詞）
mulched,mulch.ing,mulch.es
To cover or surround with mulch.
覆蓋：用覆蓋層覆蓋或包圍

來源：
Probably from Middle English melsche, molsh [soft]
可能源自 中古英語 melsche, molsh [柔軟的]
from Old English melsc [mellow, mild] * see mel-
源自 古英語 melsc [醇香的，柔和的] *參見 mel-