Angel Wing Begonias Growing Under Lights Are Dropping Leaves

Question From: OHIO
Q: I have several angel wing begonias I grow under lights in my basement. Recently they have been dropping leaves. What is the reason for this so I can correct it? Thanks.

A: I don't have a crystal ball, but my guess is a sudden drop in temperature. A thermometer that registers the maximum and minimum temperature , inexpensive and available at hardware stores will be helpful. Best And Happy Yardening, Nancy.