It has never crossed my mind b/c they get huge in pots and once something is in the ground, I seldom dig it up other than to divide or move to another location. I hate digging!!!! The shovel and my ground just don't get along very well!!!!
I had the thibouchina semidecandra(small leaf, bigger flower) in the ground for years and it came back every year except year before last. The thibouchina grandifola(large velvety leaf, small flower) is too tropical for our climate in the ground.
