Does cuckoo flower self seed?
Once established, it needs little attention. Deadhead spent flowers to encourage a light second flush and prevent excessive self-seeding. Cut back foliage in late autumn or early winter to tidy up and prepare for regrowth in spring. Avoid letting the soil dry out, especially in summer. Regular deadheading (1-2 times a week) encourages the plants to put their energy into creating continuous growth and more blooms. Deadheading is a simple task, that only requires you to pinch or cut off the flower stem below the spent bloom, and just above the newest set of healthy leaves.