Mike, I have grown Xie Shan for 10 years. The taste is amazing. I have attended three Citrus Expositions, at two of the expos (Charleston and Alabama) there was a best tasting citrus contest. Xie Shan won at both expo. I grow my tree inside a large greenhouse, so I cannot attest to it cold hardiness. However, Satsuma as a group, are considered a hardier fruit, tut to what degree I cannot say..