It’s been about five weeks since I planted my upside down tomato plant, and, I’m very pleased to report, it’s doing great! For comparison’s sake, I planted an additional tomato plant, albeit a different variety, in the ground next to the shepherd’s hook. The plant hanging is DOUBLE the size as the one in the ground, AND the upside down plant has THREE tomatoes on it already, whereas the right side up one has none. The hanging plant did want to grow upward for the first four weeks, but just in the last few days it finally gave in to gravity. So, in conclusion, ass over teakettle is the way to go with tomato plants. IMHO.