How to over winter tuberous begonias?

You can prepare the tubers and wait for them to be ready. When ready, you can cut them back, dig them up, and try cleaning and drying them. Once you've done that, the best thing you can do is store the tubers somewhere cool, dark, and dry. And last but not least, it's essential to watch them and ensure they're doing well! If you'd like to replant, you can prepare a planting medium with good drainage and a warm and light place for your little tubers to grow.