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.
I started using 3-4 pieces of Osmocote as fertilizer - 2 week once.
Alternatively I spray root hormone (Seaweed solution) also used another rooting hormone (Vitamin B1) a solution for stronger root growth as these are prone for root rot.
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.
Cane Begonia Care & Cultivation information.