I had some cannas a few years back in a pot that I successfully overwintered for an extra season. I kept it near my sunniest window in the winter, and continued watering it, fertilizing a time or two over winter, and it came back the next spring. The next winter I did the same, but it didn’t rebloom that time.
Noted! I have a lily plant we’ve done that with for a few years. So far, it’s come back, but, this year with no flowers despite fertilizer: I suspect it badly needs repotting.
Our lily’s in the front flower bed (actually has decent drainage) are doing nicely: I hit them with bloom booster earlier this spring and it looks like that paid off. :-)