Dahlia is a bulbous plant originating from Central and South America. Dahlia flowers are varied in color, shape and size. There are a great many horticultural cultivars in the world. In Japan, cut dahlia flowers have been popular in recent years because a reddish-black cultivar, ‘Kokucho,’ stimulated a dahlia boom among retailers. However, the short vase life (5–7 days) of cut dahlia flowers has curtailed the expansion of demand.