PROBLEM TO BE SOLVED: To provide mulching material having no need of disposal of ash and having excellent effect of preventing growth of weeds; to provide a vegetation base material suitable for growth of trees; and to provide a greening construction method facilitating nature conservation better suited to each of local lands. SOLUTION: The mulching material 1 is obtained by crushing mowed-down trees and weeds, subjecting the crushed mowed-down trees and weeds to heating pressurization, and drying the heated/pressurized trees and weeds so as to be sterilized by heating pressurization and drying them to be fermented so as to turn into nutrient elements. The vegetation base material 3 is obtained by admixing plant seeds to the obtained mulching material 1. The greening construction method comprises using local seeds 2 of the land to be greened, as the seeds to be admixed to the vegetation base material 3 to be sprayed to the construction surface to efficiently carry out greening construction suited to the landscape of each of the local lands. The method has no need of disposal of ash because the mowed-down trees and weeds are not burned. COPYRIGHT: (C)2008,JPO&INPIT
