How to Prune blue-flowered Cupid's dart?
Cut back after flowering

blue-flowered Cupid's dart · Catananche caerulea
Also known as: blue cupidone; blue succory; compulsion-of-love; cornflower; flower of love; Greek love plant; blue daisy
Suited to any well-drained soil in full sun; good drought resistance. Often short-lived especially if grown on heavy soil
Cut back after flowering