How to Prune devil's bit scabious?
No pruning required

devil's bit scabious · Succisa pratensis
Also known as: blue ball; blue bonnets; blue kiss; blue scabious; curl daddy; fore-bit; fore-bitten-more; ofbit; ofbitten; blue buttons; blue caps
Grows in any moist soil in sun or partial shade. Excellent for peaty bog garden. Long flowering season
No pruning required