I have had a tuberous begonia for a few years. I keep it outside in a spot where it gets some sun but is under a shady tree. I bring it in during the winter. It grows bigger each year and the leaves are full and healthy. It has never flowered. I have tried giving it more water or less water, more sun, less sun, fertilizer for flowering plants, tomato fertilizer, no fertilizer. What am I doing wrong?
