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Soviet Fruit Trenches: Cultivating Subtropical Plants in Freezing Temperatures
(solar.lowtechmagazine.com)
<<<<<<< / c / g a r d e n i n g >>>>>>>
read braiding sweetgrass, lib
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https://www.youtube.com/watch?v=Qvk7Sszh6fg
A similar system adapted from the Andes that I'm keen to try once I have homesteading land. One guy in Nebraska combines that with geothermal heating to grow citrus in extremely cold, windy prairie land: https://www.youtube.com/watch?v=ZD_3_gsgsnk
I found YouTube links in your comment. Here are links to the same videos on alternative frontends that protect your privacy:
Link 1:
Link 2: