Purple Cone Flowers turning black and wilting Home › Forums › Flower-Garden Questions › Annuals and Perennials › Purple Cone Flowers turning black and wilting This topic contains 0 replies, has 1 voice, and was last updated by Anonymous 8 years ago. Viewing 1 post (of 1 total) Author Posts September 13, 2008 at 5:48 pm #28426 Anonymous 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. Author Posts Viewing 1 post (of 1 total) You must be logged in to reply to this topic.