I can't grow tuberous begonias here, but I think you've got the general idea just fine. I would mulch them well too. In the fall when the weather starts getting cooler they will probably signal you that they're about to go dormant, or if you're in danger of frost even before they slow down, dig them, shake off the loose soil, I'd lay them out on newspapers somewhere cool and shady and let them absorb the strength in the plant before cutting them off especially if you have to dig them before they start going dormant on their own. There are a number of methods for storing them then--in peat moss, perlite, shredded newspaper, hung up in onion bags or old panty hose--ventilation and not totally dry, and above freezing.

Thanks for the reply! It is nice to know that I am on the right track anyway. :o)

Stan

Go here. Great site.

I grow my tuberous begonias in containers only.

Here is a link that might be useful: MikeStevens begonia page