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Growing technique for winter gardening I heard about?

 
Nathan King
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Someone told me that you can dig a hole in the ground and put something like a cold frame over the top of it to grow vegetables like kale and peas in the winter. I can't find any info on this. My guess is the hole is to provide extra room for the plant to grow.
 
jacque greenleaf
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Location: Burton, WA (USDA zone 8, Sunset zone 5) - old hippie heaven
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Actually, it's for protection from cold. If you google "pit greenhouse" you'll see a wealth of examples. Pit greenhouses are an old technology for avoiding the fuel costs of heated greenhouses.
 
Casey Halone
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http://www.backwoodshome.com/articles2/martin104.html

horse manure hotbeds! if you have any horse owners around you, they will PAY YOU to clean out their stalls of this stuff and put it in a pile. if you offer to haul it off, some will pay you MORE!

 
jacque greenleaf
pollinator
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Location: Burton, WA (USDA zone 8, Sunset zone 5) - old hippie heaven
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Depending on where you live and what you want to grow, you may not need the heat provided by the manure. This winter, I am experimenting with growing lettuce in earthboxes, with the earthboxes enclosed in hay bales which are topped with used double-pane windows. Hay bales will start to steam and release heat, and I am betting that in my climate, this will keep the lettuce in good condition and even growing. We'll see!
 
                              
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Location: Mediterranean
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I dug a pit that I'm going to use for a toilet in the future, and a tomato plant self seeded in it in spring, and is still flowering and fruiting almost into December, while my other tomato plants all stopped setting fruit. I never watered the plant and I'm in the Mediterranean, with no summer rain. So pits have certainly piqued my interest.
 
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