I have a large leaf begonia 4-6 " with light pink flowers (now) in a greenhouse and would like to ID it if possible. I was told it was begonia nigrans but the closest I can come to an ID is begonia Black fancy. I was also told it was grown for it's leaves rather than the flowers. I have had it floor several years and it's in a very large pot on the floor in my greenhouse. Also took a cutting and that is staying on the large side. Any ideas?