leaves drying up and falling off

Question

I have four beautiful hardy begonias. All of a sudden the leaves on a healthy stem will start curling up (in a matter of a day) and then turn brown and die. This has happened on three of my plans. Any suggestions.

Answer 1

This article should help:

https://www.gardeningknowhow.com/ornamental/flowers/begonia/curling-begonia-leaves.htm