They seem to be hardy in zones 8-10 but I'm not sure they will fruit in the coldest zone. They might fruit in a warm year. They are gendered trees so need to grow both males and females to get fruit. Yet another plant I would like to try growing!
I grew some from seeds I planted. They lived for about 4 years but then froze at 19F. I'm in Leander, tx (north of Austin) hill country. They grew great in our limestone soil. I still have one but I never water it and it is short, no trunk, just 3' leaves.