Mine flowered last year (U.longifolia) I keep it in my windowsill, it kinda goes to sleep a bit right around now with the cooler temps, but wakes up sometime in about ?January?? Dunno the specifics, but it is REALLY rootbound. I keep it pretty much wet year round, but with a generally lower water level in winter.
If I get success again this year with the flowering, I will let you know, but last year it was most definitely in february-april that it made its big honkin flowers- O lny have a really crummy "real" picture of it sadly, but it is good enough to sho wthe colour and size of it