Abstract: A roll-formed frame is provided for portable enclosures of the type comprising a series of screened wall panels with flexible hinges interconnecting the upright edges of the same. The wall panels are arranged into a closed polygon configuration, and support a domed, fabric roof. A pair of flexible cables extend around the top and bottom of the wall panels with retainers interconnecting the same, and retain the wall panels and roof in position. Roll-formed frame segments are interconnected to form the rectangular margin of the wall panels, and include a roll-formed channel in the outer peripheral edge. The channel has a dovetailed shape to interchangeably receive and retain therein a bead portion of the hinge, the fastener cables, and a body portion of the retainers. Preferably, the beads on the flexible hinge have a wedge shape which fits loosely into the side channels, and the cable retainers are symmetrical, so that they can be used on either end of the wall panels.

Abstract: A portable, self-contained greenhouse includes a base pan having longitudinally extending troughs adjacent the sides thereof and a curved bottom panel. A transparent enclosure including a plurality of slidable, transparent wall and roof panels is supported on the base pan. An automatic heating arrangement is disposed partially within the base pan for uniformly heating the soil mixture contained therein. Artificial lights and a control system are included for selectively, artificially stimulating the plants as a function of ambient lighting conditions. A moisture indicator is also provided.