How to Prune Codonopsis clematidea?
Cut back faded stems in late autumn

Codonopsis clematidea · Codonopsis clematidea
Thrives in light, fertile, moist but well-drained soil in sun or part shade, with shelter from strong winds. Will happily scramble through shrubs to give a second flush of flowers. Plants die back to overwinter as tubers and can be late to emerge in spring, will benefit from a winter mulch in colder regions
Cut back faded stems in late autumn