mulch
n
protective covering (eg of straw, rotting leaves, or plastic sheeting) spread over the roots of trees and bushes, to retain moisture, kill weeds, etc 護根(用以保持水分、 消滅雜草等的覆蓋物, 如稻草、 腐葉或塑料膜). mulch, v [Tn]
cover (plant roots or the ground round them) with a mulch 用護根覆蓋(植物根部或其周圍地面).