If the summer bedding type (usually bought as plugs or in very small pots) it may be possible to overwinter them (same method as above) if they have developed tubers but it's usually far more trouble than it's worth with most going rotten so bedding types are normally discarded at this time of the year - it's the compost heap for mine.
A trowel in the hand is worth a thousand lost under a bush.
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Hi Nikki, if they are the tuberous type, see here:
http://www.bradsbegoniaworld.com/tuber.htm
If the summer bedding type (usually bought as plugs or in very small pots) it may be possible to overwinter them (same method as above) if they have developed tubers but it's usually far more trouble than it's worth with most going rotten so bedding types are normally discarded at this time of the year - it's the compost heap for mine.
look on this thread - it is same for all begonia corms
I keep my corms from year to year and so get bigger plants
http://www.gardenersworld.com/forum/plants/begonias-begonias/146409.html