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Build an Underground Year-Round Greenhouse for Only $300 — And Grow Food All Year Long. Maybe spend a bit more and make it neater!

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from TreeHugger

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

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Pit Greenhouses or Walipinis. Depending on latitude, but despite above ground air temperatures (and wind chill), 6 to 8 feet down into the earth, temperatures remain fairly constant, between 50 and 60°F. Meaning your pit greenhouse will be much warmer than an above ground greenhouse in winter and that cool earth will keep temps bearable in the summer.

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