I found this very unique way to build a underground greenhouse on a low budget.
I'm use to building a greenhouse like the image below, as I'm sure most are accustom to... :')
How To Build a Greenhouse
I'm not sure if this is a great idea, digging and building the soil is allot of work, but it's a nice concept because you are under the ground which keeps the same temp all year around. At first thought it seem dirty and not very well kept from the photos, but more thought into this and if you have a good landscape that would allow something like this I wouldn't mind trying just a small underground garden to start out. One good and bad thing is I live in the south east and its hard clay which is hard to dig a under ground garden, but once your down its pretty stable so its worth a try.
Growers in colder climates often utilize various approaches to extend the growing season or to give their crops a boost, whether it's coldframes, hoop houses or greenhouses.
Greenhouses are usually glazed structures, but are typically expensive to construct and heat throughout the winter.
A much more affordable and effective alternative to glass greenhouses is the walipini (an Aymara Indian word for a "place of warmth"), also known as an underground or pit greenhouse. First developed over 20 years ago for the cold mountainous regions of South America, this method allows growers to maintain a productive garden year-round, even in the coldest of climates.
Here's a video tour of a walipini that even incorporates a bit of interior space for goats:
How a Walipini works and how to build one
C Benson Institute - Underground Greenhouse
It's a pretty intriguing set-up that combines the principles of passive solar heating with earth-sheltered building. But how to make one? From American sustainable agriculture non-profit Benson Institute comes this enlightening manual on how a walipini works, and how to build it:
The Walipini utilizes nature's resources to provide a warm, stable, well-lit environment for year-round vegetable production. Locating the growing area 6'- 8' underground and capturing and storing daytime solar radiation are the most important principles in building a successful Walipini.
The Walipini, in simplest terms, is a rectangular hole in the ground 6 ? to 8' deep covered by plastic sheeting. The longest area of the rectangle faces the winter sun -- to the north in the Southern Hemisphere and to the south in the Northern Hemisphere. A thick wall of rammed earth at the back of the building and a much lower wall at the front provide the needed angle for the plastic sheet roof. This roof seals the hole, provides an insulating airspace between the two layers of plastic (a sheet on the top and another on the bottom of the roof/poles) and allows the sun's rays to penetrate creating a warm, stable environment for plant growth.
This earth-sheltered greenhouse
taps into the thermal mass of the earth, so that much less energy is needed to heat up the walipini's interior than an above ground greenhouse. Of course, there are precautions to take in waterproofing, drainage and ventilating the walipini, while aligning it properly to the sun -- which the manual covers in detail.
Best of all, according to the Benson Institute, their 20-foot by 74-foot walipni field model out in La Paz cost around $250 to $300 only, thanks to the use of free labour provided by owners and neighbors, and the use of cheaper materials like plastic ultraviolet (UV) protective sheeting and PVC piping.
Cheap but effective, the underground greenhouse is a great way for growers to produce food year-round in colder climates. More over at the Benson Institute and the Pure Energy Systems Wiki.
You can also research greenhouses
information here on Earth Mum or all around the internet for the endless ways to build one for you and how greenhouses work, build your own greenhouse, lean to greenhouses, and much more. There really is no set way to build a proper greenhouse, its usually what every you have to work with and try to do it per your budget.
Thanks for reading!