“Chagusaba”(“semi-natural grasslands”) represents an exemplary system of traditional agricultural techniques, where grasslands are maintained around tea fields to supply mulch that improves the quality of tea cultivation. Chagusaba is a rare example of codependence between agricultural production and biodiversity, each of which enhances the other’s value (See Photo 1). For more than 10,000 years, Chagusaba areas have been maintained through human activity. However, the area of the semi-natural grasslands has been reduced with the modernization of agriculture. This disuse has led to a serious and rapid decline in the biodiversity of Chagusaba. Despite the modernization of tea cultivation (mechanization of harvesting methods and infrastructure improvement of tea field) and tea processing, the traditional agronomic method reflected in Chagusaba continues to be practiced. Farmers consider Chagusaba to be important for high-quality tea production. The active use of the grass has enabled Chagusaba to be maintained and as a result its rich, wild flora, including rare species, still exists today. The biodiversity of Chagusaba is conserved by periodic mowing of the grass and the exclusion of both the grazing by livestock and prescribed burning (See Photo 2). Over 300 species of meadow plants alone have been recorded in Chagusaba areas (See Photo 3.). Thus Chagusaba is an extremely unique global example of an agricultural landscape in which green tea production is integrated with the grassland management. Although Chagusaba requires labor-intensive management, this system can produce high-quality tea that trades at a high price. This good economic return has been a motivation for farmers’ efforts to conserve and manage Chagusaba. In recent years, however, high market prices for quality tea have not been stable. This reality adversely affects farmers’ willingness to invest the time required to produce high-quality tea, causing abandonment of labor-intensive Chagusaba. Chagusaba can be conserved only through healthy farm management for tea production. We expect that the certification of GIAHS will help to build a framework in which farmers’ efforts to produce quality tea can be appropriately rewarded and that adding value to the farmers’ work will facilitate conservation of Chagusaba and its biodiversity.