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Why do my coneflower petals keep disappearing?

I have not had much luck with my coneflowers. They seem to grow well enough on my sunny, clay slope, but it almost looks as if something likes to eat the flower petals. I never see any pests on the plants, but the petals keep disappearing. I have replanted them a couple of times. Could it be that I just need to let them settle in and grow stronger? Is my soil all wrong? Others in the neighborhood put mine to shame.
Submitted by j.huot

There must be some sort of pest eating the flower petals if they develop than disappear. Grasshoppers could be eating them, or possibly some other chewing insect. You may need to spray an insecticide to keep the chewing insects at bay.

Answered by DSchrock

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