Every fall, I'm unsure of what's best to clean-up perennials like Black-Eyed Suzies and cone flower or echinacea. Sometimes, the plants have not returned the following year.
By Pat C
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I cut-back both of these plants in the fall (Michigan).
I live in zone 5. I leave purple cone flowers and other perennials in my garden until spring. I never have a problem with them coming back year after year. Hope this helps you.
The black-eyed Susan will self-seed, ensuring plants next spring so don't cut back until seeds have had a chance fall from flower heads. Also, leave the seed heads to feed birds in the winter. Cone flowers should come back no matter when you cut them back.
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