This huge begonia is the best rhizomatous begonia I have. Its rhizomes grow upright and have many, many blooms. It propagates easily; stick a leaf down and get many new plants.
B. 'Selph's Mahogany'
Wow, beautiful begonia! I will have to keep my eye out for this one when mail ordering this spring.
Just love Selph's Mahogany. Very large, very easy. Blooms are insignificant probably because they bloom too early for me.
Last picture is of Plum Gorgeous (almost as big), Holley Moon, and one torn leaf of Selph.
Your Plum Gorgeous is doing much better than mine which is yet to get very large. And I'm jealous of your beautiful Rexes - you seem to have the right touch with these!