I have a rex begonia that was outside in the shade all summer, and stayed pretty happy. I brought it in when it got cold. It's the first begonia I've ever had, and I love the beautiful foliage. However, I know nothing about the basic care that rex begonias prefer. It has lost a few leaves (they dried up). It now has a leaf that's yellowing and on it's way out. I suspect it's a watering problem. When it was outside I only watered it once in awhile, and I've continued that since bringing it in.

Also - what are their fertilizer and lighting preferences?

Deanna