Giving the plant growth accelerator to the plant, low being luminous intensity which cultivates the plant low under luminous intensity condition cultivation method, the aforementioned plant growth accelerator, is low luminous intensity which includes those which one are selected at least from the group which consists of citric acid, malic acid and succinic acid cultivation method.植物に植物生長促進剤を与えて、低照度条件下において植物を栽培する低照度栽培方法であって、前記植物生長促進剤が、クエン酸、リンゴ酸、コハク酸からなる群から少なくとも1つ選択されるものを含む低照度栽培方法。