I think mandarin trees need to cross pollinate, so you will need another mandarin tree that bloom at the same time to get some fruits.

Sam

Most citrus including Changsha do not need cross pollination and only produce seeds that are clones even if pollinated, called polyembrony. Bad luck I suppose!

Here is a link that might be useful: mrtexas

Is this tree a seedling? It is quite common for seedling trees to bloom and not bear fruit or drop all fruit for a year or two before holding a crop.

I had several trees to skip blooming this spring due to the long and terrible winter.

Thanks, all. It's not a seedling - it was rooted cutting given to me by a friend about 10 years ago, but this was its first bloom, so maybe that is a factor.