Certified GKH Gardening Expert
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.