Here is a drawing of the mound for storing vegetables over the winter safely and energy-free:
scroll down to the second drawing on this page:
http://urbanext.illinois.edu/tog/storing.cfm
my note: it says in the article for mild temperatures - and my grand parents as all people
in France in their area were doing it - it is not for mild temperatures only. a heavy snow
and super cold winter can't and won't touch veggies kept that way. I remember
winters when only chimney were sticking out and yet veggies were just fine.
once you have thick layer of straw and soil, nothing can penetrate it.





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