Maggie, I lost 6 trees to freezing in the past. I planted the ones I have producing now about 4 feet from the south end of my house. The heater and the warmth of the house helps a lot to give those few warm degrees to the trees. A local guy has a small swimming pool and he planted his around the pool, same principal a few warmer degrees. I'm going to try a couple of trees from McKenzie Farms in South Carolina, 834-389-4831. They are suppose to have some Chinese and other strain of colder tolerant Satsumas.