Provided are: a plant cultivation method which increases the cultivation area for indoor cultivation of plants； a plant cultivation system； and a rack incorporated in the plant cultivation system. This plant cultivation method comprises the steps of: setting cultivation tanks 2 for cultivation of plants P on racks 1； arranging a plurality of racks 1 so as to be adjacent to one another on a travel line in order of the growth state of the plants P； intermittently moving the racks 1 forward in accordance with the growth state of the plants P； and separating the first rack 1 from the subsequent racks 1 and placing a new rack 1 so as to be adjacent to the rear rack 1 among the subsequent racks 1.
