Begonia 'Cracklin' Rosie' is a cultivated hybrid created by Walter Dworkin around 1990. The mix parentage comes from B. 'Silvermist' is the mother of B. 'Cracklin' Rosie' and the other parent is B. 'Salmon Rubra'.
It does have a lot of similarities with Cane Begonia 'Lucerna' species - this one have the same characteristics. The foliage do change color due to how much it receives light - the more direct sunlight it gets, the more darker - burgundy it turns into. However like most begonias - they might get burned edges and the foliage may appear to be more spend or burned looking. The plus point on this is that this begonia may start induce its to blooming with tiny red flowers formed by the stem branches.
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 had used Osmocote fertiliser before and had found them very unreliable and unstable as to determine how much to use - too much and the plant withers away - too less and the plant doesn't grow to it's optimum size. Ideally using 3-4 pieces of Osmocote as fertilizer - 2 week once would be good but in case if it's over used - the begonia plant dies.
On alternative week - I spray root hormone known as (Vitamin B1) a solution for stronger root growth as these are prone for root rot. Again I use in half strength - a capful with half bucket of water.
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.