PROBLEM TO BE SOLVED: To provide a greening construction method which enables a greening work using creeping stems and the protection of a slope and has excellent workability. SOLUTION: This greening construction method comprises mixing plant seedlings 6 with additives such as a fertilizer and then applying the mixture to the slope of the earth surface to form a greening layer. The plant seedlings 6 are obtained by cutting the sweeping stems 2A of Phyla nodiflora. Many plant seedlings 6 can efficiently be obtained by cutting the sweeping stems 2A. The Phyla nodiflora has excellent fecundity, and the plant seedlings 6 can be treated similarly to seeds. The slope can efficiently be greened and protected by using the Phyla nodiflora having excellent fecundity.