The unique greenhouse design combination of these key features makes the Growing Dome^® the most advanced greenhouse kit design in the world

1. High Quality Polycarbonate Glazing Panels

Our greenhouse design features high quality polycarbonate glazing panels for a clear, rigid translucent covering that allows 62% light transmission. The 16mm, 5-wall polycarbonate glazing of our geodesic greenhouses is rated R 3.0 and is one of the premier solar greenhouse coverings available. This polycarbonate glazing of our year round greenhouses resists breakdown by ultraviolet light and harsh weather impacts, like hail. The life expectancy of the Growing Dome greenhouse polycarbonate glazing is over 20 years and the polycarbonate glazing panels come with a 10 year manufacturer warranty against yellowing and hail damage. You and your plants will love the soft diffused light inside our Growing Domes!

2. Water Tank

This extraordinary Growing Dome greenhouse design feature, a large water tank, acts as the "Power Pack" of the solar greenhouse. Our greenhouse kits are the only kits available that include this special feature. The water mass keeps the geodesic Growing Dome warm in the winter and cool in the summer creating an optimum environment in these green houses for year round growth. Unique among greenhouse designs, the water tank can be used as a beautiful space both for aquatic plants and fish. VIEW VIDEO of the water tank and how it works in our year round greenhouses.

3. North Wall Insulation (Reflectix)

The North Wall Insulation (also called "Reflectix") helps keep the Growing Dome greenhouse cozy during the long winter nights and reflects light evenly onto the plants during the day for maximum growth. Greenhouse designs including north wall insulation provide shade in the summer and, in combination with the water tank, prevent overheating. These special greenhouse design systems were pioneered over 20 years ago in our solar greenhouses.

4. Automatic Opening Window Vents

Growing Dome greenhouse automatic vent openers are heat activated and require no electricity to operate. Growing Spaces’ greenhouse designs include upper and lower vents that open and close at an adjustable preset temperature due to the expansion and contraction of beeswax in a piston. Cooling of these geodesic greenhouses is achieved as hot air escapes from the top vents and cold air is drawn in through the lower vents. This creates a "chimney" effect and prevents overheating of our year round greenhouses. The window vents open and close automatically, freeing you to go on vacation without worry about your garden.

5. Undersoil Heating & Cooling System

A solar panel in the Growing Dome greenhouse produces electricity to power a fan which blows the air in the greenhouse through pipes buried in the perimeter raised soil beds. The air at the intake next to the water tank is warm in the winter and cool in the summer, so you are effectively heating or cooling your soil depending on the time of year. This Growing Spaces system also helps circulate air through the solar Growing Dome to even out the overall temperature. One-of-a-kind in greenhouse designs, this feature makes year round growing a reality.

6. Insulated Foundation Wall

The geodesic Growing Dome sits on a 24" foundation wall which raises the greenhouse up above the snow and gives increased headroom. Raised bed gardening in our geodesic greenhouses is simple and easy on the back!

In our year round greenhouses, the foundation wall is insulated to prevent the soil in the growing beds from losing heat on a cold winter night. The Growing Dome greenhouse wall is lined with sheet metal on the inside and has a bottom plate of ProWood treated or redwood lumber for added longevity.

7. Perimeter Insulation

Our Growing Dome greenhouse designs feature a skirt of 2" blueboard insulation buried around the perimeter to prevent frost from penetrating under the wall of the Growing Dome. The entire soil mass maintains an even temperature inside our solar greenhouses, despite outside fluctuations. Other greenhouse designs don’t include this invaluable feature.