Impetus for using Jatropha is that the oil is handy for a number of purposes, and more importantly, the plant grows like a weed. It is commonly used on cruddy soil, often in the dry tropics, as a cheap hedge and/or erosion control.
In the lowland tropics, 55F is unlikely to be reached. But I will keep in mind that it might not be very useful shipped to higher latitudes! (Actually, it could be solidified and used for soap, and like wax in candles).