An apparatus is disclosed which may be used to grow plants in a chamber. In one embodiment, the chamber includes an artificial light source, a plurality of plant supports, a supporting structure configured to rotate the plant supports between two positions, the first position being closer to the artificial light source than the second, and a divider separating the chamber into a light region containing the artificial light source and one of the plant supports in the first position and a dark region containing the other plant support in the second position, wherein the divider is moveable between a first divider position in which the divider prevents movement of the plant supports and a second divider position in which the divider does not prevent movement of the plant supports. Methods of growing plants in a chamber on a moveable member are also disclosed.