A walipini / underground greenhouse is a great way to extend growing seasons, especially in cooler climates!

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A great site explaining underground greenhouses. The chimney system provides the highest volume air flow and the best control of ventilation

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Growing lemons and oranges in Nebraska? Impossible, would be the first word most people would think of, but not Russell Finch. He bills himself as the largest citrus grower in all of Nebraska. Besides citrus he also grows pears, avocados, figs, roses, yucca, agave, hibiscus, and hundreds of other types of flowers, fruits, vegetables, trees and plants. His secret? A home-built “underground” greenhouse.

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