Abstract: A modular plant growing system includes (a) a pot module having (i) a pot body with a pot body base and at least one cavity for receiving a plant growing medium, (ii) a control system, and (iii) a pot module interface on the pot body base in electrical communication with the control system. The plant growing system further includes (b) a modular expansion platform including (i) a platform body having a platform top, (ii) grow equipment in the platform body, and (iii) a platform interface on the platform top in electrical communication with the grow equipment. The platform and pot module interfaces are interlockable to detachably stack the pot module atop the modular expansion platform to connect the grow equipment to the control system for expanding plant growing functionality of the plant growing system.