Answer: I think you're doing everything right to make your begonia happy, and it is doing everything right by responding to your good care with new growth. The only thing you're not doing is pinching back the stems on a regular basis. When you pinch the stems, you encourage healthy new growth - both stems and leaves. It's natural for the oldest leaves to drop and the stems to become bare and leggy unless they're pinched back. I know it sounds like it might hurt the plant, but in reality it will help it. So, take a deep breath and pinch back one of the stems, leaving a stub with only 2-3 nodes. In a few weeks you'll see new growth developing at the nodes. Once the leaves are fully formed you can pinch back a different stem. Pinching back gradually will ensure your plant retains enough foliage to be healthy during the process. This may take a while, depending upon how many stems your plant has. During this restoration process the plant will look rather odd, but don't dispair - eventually it will become a lovely and healthy plant.
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