How to Prune delphinium 'Cinderella'?
No pruning required except deadheading, cutting spent flower spikes back to flowering sideshoots, and cutting all growth down to ground level at the end of the growing season

delphinium 'Cinderella' · Delphinium 'Cinderella'
Grow in a fertile, well-drained but moisture-retentive soil in full sun, in a position sheltered from strong winds, and provide stakes or other supports (for more advice on support, See staking: perennials and delphinium cultivation for further advice
No pruning required except deadheading, cutting spent flower spikes back to flowering sideshoots, and cutting all growth down to ground level at the end of the growing season