Abstract: The modular hydroponic growing system comprises a collection of one or more independent growing units. Each of the independent growing units provides a controlled enclosed environment for growing plants. Each of the independent growing units monitors and controls the temperature and moisture levels in the controlled enclosed environment. Each of the independent growing units monitors and controls the level of nutrients provided to the growing plants. Each of the independent growing units is identical. Each of the independent growing units comprises a container, a lid, and a management system. The management system and the lid attach to the container. The lid provides access into the controlled enclosed environment. The lid encloses the controlled enclosed environment. The management system monitors and controls the temperature and moisture levels in the controlled enclosed environment. The management system monitors and controls the level of nutrients provided to the growing plants.