Begonia Tuberous

I have two Begonia Tuberous, a white double and a red double ones. For winter time I usually keep Begonia tubers in dry soil pots occasionally watering them. Begonia Tuberous tolerates well winter storage. This year in early March I opened pots with them and saw that several young shoots emerged from the tubers. In April the shoots grew up fast and even gave first flowers indoor. 

Tuberous begonias bloom throughout the summer, mostly in shady spots where few other plants can grow. They are often used as container plants on patios and porches, in hanging baskets and as bedding plants. I always choose a protected windless spot. For most of the day, the plants will be shaded so that the sun does not hurt them. But they need a good indirect light at another time.

I noticed Begonia roots develop from the bottom, sides and top of the tuber, and stems sprout from the top. Once stems have reached 3 - 4 cm, it's time to pot the tubers into larger containers, or in permanent summer tubs.  

I try to accustom the plants to outdoor conditions moving them on a warm day to a shaded,  sheltered place, like a balcony.  At night I bring them back indoor until the temperature has cooled. 
I know Begonia is a tender plant and needs warm weather to be planted in the garden. Therefore I am in no hurry to transfer my plants outdoors. Here it is growing in a container near the pond.

Have you grown Begonias Tuberous before? What is your experience?