My beautiful begonia has been sitting above the kitchen sink since late May. I just discovered there are white to grey spots on many of the leaves. How can I treat it and keep it in the house? Or should I just dispose of it? It is still warm enough at night here (Colorado) that I can leave it outside right now, but did hope to keep the plant in the house during the winter.
What to Do About Mildew (Mold?) on Indoor Begonia
Certified GKH Gardening Expert
You can spray the plant with Neem Oil.
Use it weekly until the problem clears up. Neem Oil is safe for people and pets.
Here is a link with more information.