A small but noticable proportion of my echinacea purpurea look as if the stems just below the flower heads have been almost sliced through, such that the flowers are dangling by a thread. Think Nearly Headless Nick. A few have fully fallen off. I noticed this last year as well. Some of them are the true species and some I believe are a cultivar, but I've lost track now. One forum mentioned alternaria lesions but I'm not seeing black spots on foliage, just the beheaded looking flowers. I'd been spraying neem occasionally the past month or two because I thought I might be able to head this off. I have other photos with more context but I thought the closeups would suit better for this. The plants are in a landscape bed in the Clintonville neighborhood of Columbus. They are a mix of a few years old that I planted and some that grew from seed starting this season. Rarely irrigated so foliar fungus seems not the likeliest culprit. I'm a certified arborist and know a bit about perennials as well. What do you think? And thank you!