A foldable panel combination for a modular greenhouse is described. The combination includes a first side panel, a second side panel, a first roof panel, and a second roof panel that are hingedly connected. The combination is transitionable between a collapsed state and an open state. In the collapsed state, the four panels are in a stacked configuration. In the open state, the panels form a sidewall-to-roof-to-roof-to-sidewall structure that can be connected with other panel combinations for linear expansion. Each panel comprises a rectangular frame and a cover for enclosing art open space in the middle of the frame.
