I have 15 begoina growing in pots from bulb; some are hanging some are upright. One or two of the plants broke at the base of the bulb. When I went to dig the bulb out and store for next year, it just broke into many pieces. Why? How do I dig the other ones out after they die back without dameging the bulb. I really love them and want to use them next year.

Thanks in advance for all your help.