Alton Octagonal Greenhouse 8ft. x 8ft. The most notable feature of the Alton Octagonal greenhouse 8ft x 8ft is probably the specially designed - lantern - on the roof. The lantern contains two automatic roof vents providing extra ventilation and looks great, too. You can choose either the - glass to ground - option or have the lower panels of this timber greenhouse clad with cedar. To get the most use out of this cedar greenhouse you can position cedar staging and shelving on all sides of this impressive greenhouse. | 
