How often should I prune coreopsis?

Question

I want to ensure that my coreopsis are correctly pruned for next spring’s growth.

Answer 1

Where I live, coreopsis dies back to the ground in winter. No pruning is necessary. Maybe I'm not understanding your question. Please do another post and list where you live and what type of coreopsis you have.
https://www.gardeningknowhow.com/ornamental/flowers/coreopsis/coreopsis-overwintering.htm
https://www.gardeningknowhow.com/ornamental/flowers/coreopsis/growing-coreopsis-flowers.htm