A plant growth control system (100, 200, 300), comprising: an information collector (110, 210, 310), a processor (120, 220, 320) connected to the information collector (110, 210, 310), and a controllable light source (130, 230, 330); wherein the information collector (110, 210, 310) is configured to acquire growth information of a plant, the growth information comprising at least one of branch and leaf distribution information of the plant and flower distribution information of the plant; and the processor (120, 220, 320) is configured to determine, according to the growth information, a target irradiation position of the controllable light source (130, 230, 330) in the plant, and to control the controllable light source (130, 230, 330) to irradiate the target irradiation position in the plant, wherein the information collector comprises at least two light intensity sensors; wherein the light intensity sensors are configured to acquire light intensities yielded after ambient light penetrates through the plant; and the processor is further configured to determine the growth information of the plant according to the light intensities acquired by the at least two light intensity sensors, wherein the processor is configured to: control the controllable light source in an ON state to rotate, and stop rotation of the controllable light source when the light intensity sensor corresponding to the target irradiation position acquires a light intensity greater than a predetermined light intensity; or control the controllable light source in an ON state to move, and stop movement of the controllable light source when the light intensity sensor corresponding to the target irradiation position acquires a light intensity greater than a predetermined light intensity; or control a flower pot where the plant grows to rotate, and stop rotation of the flower pot when the light intensity sensor corresponding to the target irradiation position acquires a light intensity greater than a predetermined light intensity, the plant growth control system further comprising a base for accommodating the flower pot, wherein the base may be electrically connected to the processor, and wherein the base may be in a rotation state or a stationary state under control of the processor. control the controllable light source in an ON state to rotate, and stop rotation of the controllable light source when the light intensity sensor corresponding to the target irradiation position acquires a light intensity greater than a predetermined light intensity; or control the controllable light source in an ON state to move, and stop movement of the controllable light source when the light intensity sensor corresponding to the target irradiation position acquires a light intensity greater than a predetermined light intensity; or control a flower pot where the plant grows to rotate, and stop rotation of the flower pot when the light intensity sensor corresponding to the target irradiation position acquires a light intensity greater than a predetermined light intensity, the plant growth control system further comprising a base for accommodating the flower pot, wherein the base may be electrically connected to the processor, and wherein the base may be in a rotation state or a stationary state under control of the processor.