How to Prune rose campion?
Deadhead to prolong flowering

rose campion · Silene coronaria
Also known as: Bridget-in-her-bravery; corn rose; crown of the field; dusty miller; garland flower; mullein pink; pink mullein; red bird's eye; campion; rose cockle
Grow in any moderately fertile, well-drained soil in full sun or partial shade
Deadhead to prolong flowering