Abstract: A hot bed enclosure for starting new plants includes a pair of generally upright and longitudinally spaced apart transparent end walls together with a top cross bar and a pair of bottom rails connected to and extended between them to provide a structural framework for the enclosure. The top cross bar and bottom rails are secured to the end walls by readily detachable fasteners such as hinges with removable hinge pins. The open top of the enclosure is closable with a pair of transparent doors pivotedly mounted on the top cross bar. When closed, the doors are preferably disposed at a 42.degree. angle to the ground and the enclosure is preferably positioned with the opposite end walls facing north and south. When not needed, the enclosure is readily broken down for compact storage.