I read on line where the beans grow and looked up the latitude and sunrise sunset times.
Indochina AKA Vietnam.
The (extremely) photo sensitive was the clue and reading of the difficulty of growing them in the sub tropics in other words outside the tropics.
We live in the sub tropics as far as day light and night hours are concerned, not so much as climate is concerned as this has so much to do with other factors such as.
Jet stream.
Altitude.
The north and south pacific current and gulf stream.
The Sahara desert to name but a few.
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