About my coneflower…

Question

We have a pretty big problem with aphids and powdery mildew on two of our three coneflowers. Since it’s mid-August already, should we cut our losses, cut the coneflowers down now, and use the solutions you provided in your articles to prevent it from happening again next year – or – will the early pruning be detrimental to the long term health of the plants? Thanks so much!!

Answer 1

It is likely the plants will not have any issues with being cut down now. Dispose of the plants so that the insects and Powdery Mildew does not spread.
I myself just did the same cut back in my own garden.

https://www.gardeningknowhow.com/plant-problems/disease/powdery-mildew-homemade-and-organic-remedies.htm