I have visited a Citsuma Prague tree in Vancouver, WA, zone 8a (right across the border from Portland, OR) near the wall of a house in a suburban neighborhood. It produced fruit last year but not this year. The man who owns the tree says that they do ripen and that they are very similar to Satsuma inside the fruit, although just a little bit more sour.

The tree was maybe just slightly under 4 feet high, very bushy. The tree looks very similar to Flying Dragon except a few parts (segments) of the branches have regular leaves that are not trifoliate.

I did see the unripe green fruits, they do not look like the fruits of Flying Dragon trifoliate. The exterior kind of looks like sour green hard. I did not get to see or taste the fruits ripe however.

socalnolympia, thanks for the report. Apparently it's a chimera (or not!), and so part of the plant is Poncirus, and part of it Mandarin.

I've read that the fruit can be really good - pure satsuma! However, occasionally a more Poncirus-like portion may fruit inedible Poncirus fruits, which is unfortunate. So it has potential as a hardy edible, but is somewhat unstable. It is not known for being a dependable bloomer. It is also not the most photogenic of plants and shares traits of Flying Dragon, being extremely thorny with a combo of tri, bi and unifoliate foliage .

That's what I've been able to glean anyway.

There's a guy in South Carolina with a huge chimera in his . He was on facebook showing it one day.