That's really interesting growing citrus in such extremes. I wonder if the cultivators still exist and if for historical preservation of farming methods if a couple of small plots were kept as they were.

It shows that some ideas are bound to repeat - I landed on a similar solution about 35 years ago looking to grow a plant sensitive to wind burn and though not frost ... cool snaps in the tropics - a simple hot box was where I started but a deep pit was the solution I landed on ... worked ok for a test, however not practical on scale.