Are Begonia corms the same as Begonia tubers?
Corms are essentially the same as tubers, but are closer to bulbs. Corms look a lot like bulbs on the outside. They have the same type of protective covering and a basal plate like the bulb does, but do not grow in layers. Like a corm, a tuber is a solid mass. However, it does not have a basil plate, or a tunic-like covering. A tuber has leathery skin and eyes (like a potato). The eyes are the growing points where the plants will emerge. With begonias, you may have both corms and tubers, depending on the variety. For example, tuberous begonia grows from tubers while many others grow from corms.
Does a tuberous begonia multiply by growing more tubers?
Yes, they do. They can also be propagated by cuttings.
Does it matter which way they are planted?
What month do you plant begonia corms?
I have a large begonia house plant that I want to separate to start another plant. How do I do it?
Propagating begonias is normally done by cuttings rather than by division. This article will help you with propagating your begonia:
Will large flowered begonias planted this year make corms that can be stored at the end of the season?
It should. A mature begonia should produce corms.
I've got impatiens and begonias that I want to keep forever. Is this possible?
Well, I don't know about forever, but you can overwinter begonias and impatiens root quite easily so it's possible to propagate new plants each year for a continuous supply. These articles may help: https://www.gardeningknowhow.com/ornamental/flowers/begonia/wintering-begonias-overwintering-a-begonia-in-cold-climates.htm
I have kept impatients in my house over winter but they don't do very well. However, I have several plants that did ok and are blooming beautifully outside.