A novel prefabricated garden box for use in growing plants with a raised bed, comprising a plurality of posts, beams, crossbeams, an inclined roof and slidably rigid transparent or translucent door(s). The enclosure includes multi-channel slidetracks and is fillable with soil and gravel under conditions that provide a suitable growing environment. The garden box, when fully assembled, rests on a ground surface or subgrade and may be preferably constructed to conform to dimensions suitable for shipping, packaging and transport before assembly by an end user/gardener.