Mums Turning Light Gray

Question From: NEW MEXICO
Q: The leaves on my mum are turning light gray. Can you tell what's causing it?

A: Elena, I believe your mums are suffering from a fungus called powdery mildew. I would cut back the diseased leaves and put them in the trash. In spring I'd divide them to give them more air circulation. Best to water them at soil level early in the morning. Best Nancy and Happy Yardening!