This forum helped me with my begonia questions previously, and the advice enabled me to save my three begonias. Now, my 'Escargot' is puzzling me. It is growing very nicely; however, the plant never has more than two leaves - once there are three leaves, one will start browning on the tip of the leaf and the browning will start curling up until the leaf is totally browned and curled up and drops off. Any thoughts about what I can do to prevent this?