You really want to obtain the Honey Changsha citrus. I had a young one take 15F this year with no leaf damage and I had one take around 11F with just leaf damage. The difference between the standard and Honey is all taste. The standard Changsha is almost inedible in my opinion. There is not flavor and seems a bit pithy to me. The Honey is just as good as those Little Cutie citrus you buy in the store. You still have the issue with seeds. I have about 14 trees and one only produces about 8 seeds per fruit where 20 is about normal. You get used to just eating the seeds with the citrus after a while.
There are seedless varieties of Changsha on the market as Artic Frost and Orange Frost. They used radiation on the seeds to create this effect. However, they are over-advertised in cold tolerance and only hardy around to 15F. Since they are on their own rootstock, it isn't a problem if you freeze to the ground because the same tree will come right back.
Good luck!
