Provided is a cultivation method for plants of the genus Glycyrrhiza. This method is not affected by weather, is capable of including at least a prescribed amount of an active ingredient in a short period of time, allows for easy harvesting and post-harvest processing, and has excellent cost performance. In order to solve the abovementioned problems, the present cultivation method includes: covering a ridge of a prescribed height in an open field with a sheet impervious to water； installing, on the ridge through an installation hole in the sheet, a cultivation support cylinder that has a length between100 mm and 300 mm, has one or more openings in the bottom plate, and is filled with nutrient-rich cultivation soil； planting a plant of the genus Glycyrrhiza in the cultivation support cylinder； controlling the moisture inside the ridge by blocking rainwater with the sheet； inhibiting the stolon growth of the plant of the genus Glycyrrhiza in the horizontal direction with the side walls of the cultivation support cylinder； inducing the growth of roots, that grow vertically through the one or more bottom plate openings, inside the ridge in which moisture is controlled； and enlarging the root (taproot) as well as branched side roots.
