Coneflower. Mold?

Corpus Christi, TX

I bought some green envy echinacea last July and they are finally coming coming into bloom. Which is awesome. But Its been wer
t, cool, and cloudy and the leaves look "powdery". Is that normal? If not, how do i remedy the problem?

Thumbnail by Numanguy83
Hadley, PA(Zone 5a)

It might be powdery mildew:
http://www.ext.colostate.edu/pubs/garden/02902.html

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