In a plant cultivation method, in cultivation of a plurality of plants within a cultivation bed which includes nutritive elements required for growth of the plants, a location adjacent a growing point of the plants is selected to supply gas to the growing point. In a plant cultivation apparatus, a cultivation bed is provided on which a plurality of plants are cultivated. The cultivation bed includes nutritive elements required for growth of the plants. An apparatus body for accommodating the cultivation bed has a gas-supply unit for supplying gas toward a location in the vicinity of a growing point of the plants. A gas-conditioning unit is arranged on the apparatus body for conditioning gas therewithin. An illumination unit for emitting a light to the plants.