The greenhouse consists of a frame covered with an envelope of plastic material. The frame consists of four rods (1, 2, 3 and 4), which are bent into a U-shape, to form a central section (a) and two wings (b). The free ends of the wings are encased into the sockets (6) of the connectors (7), which consist of two end plates (8), between which are pivoted the ends of the four rods, on parallel axes. Stiffeners (28) are inserted between the two inner rods, and the whole assembly is covered with plastics material (20).
