Ventilation keeps the plants cool when summer temperatures are high. The roof is angled to provide the most warmth and light from available wintertime sun, which keeps the greenhouse cooler during the summer. It’s possible to incorporate a walkway so the greenhouse can also be used as a root cellar. Most are 6 to 8 feet (1.8 to 2.4 m.) deep, which allows the greenhouse to take advantage of the earth’s warmth. Underground Greenhouse Ideasīuilding an underground pit greenhouse can be accomplished in various ways, but most pit greenhouses are usually basic, functional structures without a lot of bells and whistles. The structures are usually lined with brick, clay, local stone, or any material dense enough to store heat effectively. Because they are built into a natural slope, they have very little exposed area. They are also widely used in Tibet, Japan, Mongolia, and various regions across the United States.Īlthough they sound complex, the structures, which are often built using repurposed material and volunteer labor, are simple, inexpensive and effective. The structures, also known as walipini, take advantage of solar radiation and the thermal mass of the surrounding earth. Pit greenhouses have been constructed in the mountains of South America for at least a couple of decades with tremendous success. What are pit greenhouses, also known as underground gardens or underground greenhouses? In simple terms, pit greenhouses are structures that cold climate gardeners use to extend the growing season, as underground greenhouses are much warmer in winter and the surrounding soil keeps the structure comfortable for plants (and people) during summer heat. You may be able to grow some veggies year round, especially cool weather vegetables like kale, lettuce, broccoli, spinach, radishes or carrots. People interested in sustainable living often opt for underground gardens, which when properly built and maintained, can provide vegetables at least three seasons out of the year.
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