An apparatus (20) for growing plants comprises a bounded area (22) that holds a plurality of mobile carriers (24). Each carrier supports one or more rotatable plant-growing modules (26), with means for rotating the modules, and means for feeding water to plants in the modules. The module (26) comprises a cylindrical structure (54) for holding plants such that the plants grow radially inwardly toward a light source (62) inside the cylindrical structure. The bounded area has means for moving the mobile carriers, such that each mobile carrier is movable along a path within the bounded area.
