My purple coneflowers bloomed fine this year but now are turning black from ground to seed head, all through the plant. Any idea what this is and how to deal with it? They haven’t done this in the past. I’m zone 4. Thank you.
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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.