PROBLEM TO BE SOLVED: To provide a plant cultivation method in which plants are alternately irradiated with red light and blue light, in which growth of plants is further accelerated.SOLUTION: There is provided a plant cultivation method including the steps of (A) irradiating a plant with red light and (B) irradiating a plant with blue light individually and independently in a fixed period, in which photosynthetic photon flux density of red light in the step (A) is larger than 150 μmol/m2s, photosynthetic photon flux density of blue light in the step (B) is larger than 50 μmol/m2s, and carbon dioxide concentration in plant cultivation environment in both steps (A) and (B) is 1300 ppm or more.COPYRIGHT: (C)2016,JPO&INPIT