That plant lived throughout the entire winter in that pot - didn't freeze, just kept growing. The next spring I planted it in the ground in a corner of the garden where the grandkids would not run into it (note the sharp thorns!) and it grew woodier and bigger, and we had several volunteer little plants spring up all around it.
Since then, I've been able to keep one of these plants going by just digging up volunteers. This past fall I transplanted one of the volunteers and kept it in the greenhouse to put out in the garden again. It's been transplanted out to the herb garden now and it's growing gang-busters! Litchi doesn't seem to be very fussy about what type of soil it's in either. It seems to enjoy just being watered occasionally and ignored.
Papery white flowers
Even the sepals are covered in thorns.
Thorns on top and bottom of the leaves
It's been an interesting plant, well worth growing. Just keep it away from foot traffic!