Hello everyone:
I have a patch of purple coneflower I started two years ago from seed. It has some tall, white valerian in the middle and is next to a very quiet road. The plants flowered great this year, but the petals are turning black at a pretty constant rate. I only get a day or two of unblemished blooms before the petals go. The leaves are untouched. I live in SW Ohio, zone 5, and it's been a somewhat dry summer, and I haven't deep watered the bed but once or twice.
Is this a disease? Something I'm missing? A sign that the soil in that area is terrible? What could be the problem? And what might I do?
Thanks,
Laurel