Climate-neutral tropical fruits in Franconian Siberia

Schmitt züchtet an einem der kältesten Orte Deutschlands Tropenfrüchte - auch australische. Source: Ralf Schmitt/Tropenhaus am Rennsteig
The north of Upper Franconia is one of the coldest regions in Germany. The area is therefore also called Franconian Siberia. But papayas, star fruits, finger limes and the like are now growing here. Gardener Ralf Schmitt grows his climate-neutral tropical fruits in giant greenhouses. How can this work?
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