I took a look at the pots at my house...
Not as proportional as your pots.
I potted my plants when they were small, and then?
I've ignored them. As they've rooted into the ground below, it doesn't matter that the pots are too small.
I have patches that aren't in pots... the group of 3 aren't potted, but do show how nice these are.
The videos are of one of my potted ones.
Yeah, I think you'll get flowers, just not as showy.
When we're waiting for flowers, it seems like they take forever... but I think 3 or 4 years for aralia spinosa.