A plant growing system protects plants during spring, for early and/or fast growth, and supports the plants later in the growing season. Frames hold panels that protect the plants by enclosing, shielding, and/or shading the interior growing space, and upon removal of the panels, the frames may support the larger plants and their fruit/vegetables. Multiple cooperating frames pivotally connect to form modular units of various sizes and shapes, and a latching/locking feature may stabilize the unit by preventing accidental disconnection of the frames. The frames may include feature(s) that allow, and stabilize, stacking of multiple units for accommodating taller plants. The panels held by the frames may be translucent/transparent, opaque, or a combination of the two, for customizing the interior environment inside each modular unit to the plant(s), the time of year, and/or the location and climate.
