Mildew on Zepherine?
I hope the picture is clear enough to see the white, powdery gunk on my Zepherine de Drouhin. Is this mildew -- in California, in a drought?
I had had it in a pot resting on a plastic saucer inside another pot. There was water in the bottom of the second pot. Could this have caused the problem?
Is this serious enough that I have to do something about it -- and if so, what?