I have 2 Fusion Glow Exotic Impatiens that have tiny black spots all over the leaves.

I've been putting them in the garage every night because of the cold weather. They're in clay pots. Do you suppose they got too cold anyway? Or is it caused by some kind of fungus?

Is there any natural way to save these plants? Milk maybe?

If and when the weather warms up will they possibly be O.K. or are they destined to die no matter what I do now?