Hello Oliver,
the trick was performed just today. I left out the hot water part as the day was really sunny and hot. I just made and filled the holes in the morning and then I left them open for the sun to heat the inside. Planting out only started at 6 pm. I didn't bother to measure the temp, but it felt warm to touch - probably over 80°F. Tomorrow's gonna be another hot day, so I plan to put the non-woven fabric back in the evening to prevent heat loss. Considering how much energy the soil absorbed today and hopefully also tomorrow, I am quite confident it will work. I'll certainly report the results here.
Milan HP
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