Just like most Cane Begonia species - this one is grown on a medium:
50% coco chip mixed with sand & potting mix. I found this medium used for propagation by the nursery owner - I had slightly added the same medium type and re-pot it in a bigger pot.
So far - the plant doubled it's size.
There are many various methods and styles that I had found and researched among gardeners and begonia enthusiast growers.
Slightly spray water once a day in the morning and refrain watering rainy days.
I do water twice a day on a dry and hot days - it's depending on the weather.
Other matters are very much similar with the general information about Cane Begonias.
Do click below for more information on Cane Begonias.
Begonia Common Names and Images