PROBLEM TO BE SOLVED: To provide a cultivation method for plants of the genus Glycyrrhiza, wherein the 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.SOLUTION: A cultivation method includes the steps of: 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 between 100 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； making roots of the plant of the genus Glycyrrhiza grow, the root growing vertically, through the one or more bottom plate openings, inside the ridge in which moisture is controlled； and mainly enlarging the root (taproot) as well as side roots branched therefrom.
