Build a $300 underground greenhouse for year-round gardening (Video) : TreeHugger

Build a $300 underground greenhouse for year-round gardening (Video) : TreeHugger.

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.

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