The Forestiere Underground Gardens (pictured) were tunneled out in the early 1900s by Sicilian immigrant and citrus farmer Baldassare Forestiere, who dug it by hand, in California.

Discover step-by-step instructions for how to build an underground greenhouse. Grow fresh produce year-round with this innovative gardening solution.

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Deep space: John and Lisa Harris discovered an extensive underground garden at their Victorian home Dewstow House

How to build your own underground greenhouse with constant temperature all year long – WAWstock

article and photograph from The Seed Guy If eating Fresh Vegetables and Fruits Year Round is important to You and Your Family, you might consider building an Underground Greenhouse. It will keep th…