Provided are: a plant cultivation method for improving the crop acreage of plants that are cultivated indoors, a plant cultivation system, and a rack that is comprised in the plant cultivation system. The plant cultivation method of the present invention comprises: setting a cultivation vessel 2 for cultivating a plant P in a rack 1; adjacently arranging a plurality of the racks 1 on a travel line in order of growth of the plant P; intermittently advancing the rack 1 according to a growth state of the plant P; and separating the first rack 1 from the following rack(s) 1, and making a new rack 1 adjacent to the last rack 1 of the following rack(s) 1.