It's by far the easiest method with the best results that I've found yet.
Cripes! I just got around to adding up my (tuberous) begonia pots in my head...there's six, no, seven of them this year!
My under-the-house crawlspace area is shrinking even as I realize this! There's other begonias, dahlias and who-knows-what-all that has to fit in there, too!