Are they grown in the mountains at all? Even in Taiwan, where its cooler in winter, its often grown on hillside. Also due to land price mind you. The winters get cooler, 13c or so where I lived, but importantly no rain. Humid, but very little rain so the well drained soil is never wet. East Malaysia is very very wet in comparison. I bet a rock type area on a mountainside with that warm fruiting Thai variety would make the farmer a good $
