In a wet season, coneflowers can get various fungal diseases including powdery mildew and botrytis and such, though these are normally vigorous, easy plants. Are you in a zone where weather (like here) has been excessively wet this summer?
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Welcome! I’m Margaret Roach, a leading garden writer for 25 years—at ‘Martha Stewart Living,’ ‘Newsday,’ and in three books. I host a public-radio podcast; I also lecture, plus hold tours at my 2.3-acre Hudson Valley (NY) Zone 5B garden, and always say no to chemicals and yes to great plants.