Has anyone had success in overwintering these Begonias. I bought some young plants from Thompson & Morgan last year and they put on a fanastic display all summer. I have tried to keep them going in my cool greenhouse (heat on frosty nights) but despite ticking over for so long most now seem to have rotted. I had hoped to take some cuttings in the Spring.

They do not seem to be tuberous yet appear to have fewer roots than the Sempreflorens. Worth growing in pots and baskets they were smothered with flowers all summer. Any suggestions appreciated.