Extend your growing season by utilizing the Outdoor Living Today Western Red Cedar 8 x 12 ft. Greenhouse. To ensure you have enough room to work, this large greenhouse stands just over eight feet tall at its peak, is 12 feet square inside, and includes over 22 lineal feet of cedar shelving. It's built of naturally decay- and insect-resistant western red cedar with a twin wall polycarbonate roof and wall panels that allow filtered UV light through. This greenhouse features lower vents and two heat-activated vent windows in the roof that automatically open and close at 70 degrees Fahrenheit, so your greenhouse stays at the optimal growing environment.