Sorry about the photo. Hope it is clear we are about to cut through a mature begonia tuber with a knife.If we want maximum flowers per plant, there is no need to do this. However, if we want bigger blooms, it is best to limit the number of shoots to two or three. This way there is more food available per shoot.
Each half was planted in a separate pot of multipurpose compost, five centimetres (2 inches) below the surface to allow the roots which will develop on the top of the tuber (begonias are unusual in this respect) to take in water. This gives better results.
Some say that dividing in this way reduces the vigour of each tuber. But I can't say I have found this. They have always done well.
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