PROBLEM TO BE SOLVED: To construct a system in which the ability of a plant to adapt to an environment is stimulated by a combination radiation of monochromatic lights under a dark condition, disease damage resistance is enhanced, and simultaneously the growth of the plant is promoted, in order to achieve a safe vegetable cultivation technique by which the reduction of agricultural chemicals used is possible and yield is increased.SOLUTION: The invention relates to a method of comprising irradiating a plant with a green light under a dark condition, and irradiating it with a red light under a dark condition after a given time has elapsed.SELECTED DRAWING: Figure 1
