This garden bed uses the sun to warm the air inside the wine bottle to heat the soil throughout the day and into the evening.
This project was created and tested in the rainy Pacific Northwest (Seattle).
The trick to this project surviving cold winter temperatures is to place a large plastic garbage can lid over the top and arrange very large rocks on top so the wind does not blow it off. This keeps excess water out of the planter while you are not growing anything in it.
Garden Fowl website shares how to make a recycled wine bottle solar heated garden bed project.
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