How to prune yarrow 'moonshine'

Deadhead continuously through summer; full cutback in autumn or early spring. Deadhead by cutting flower stems to a lateral shoot or down to the basal rosette. In autumn, shear the remaining foliage to 10 cm. Divide congested clumps by lifting, splitting, and replanting healthy outer sections.

Deadhead regularly in summer; full cutback annually. Achillea 'Moonshine' benefits from deadheading through summer to prolong flowering and prevent self-seeding. Cut spent stems back to the next lateral bud or basal foliage. Cut the whole plant back to the low foliage rosette in autumn or early spring. Dividing clumps every 2–3 years keeps the plant vigorous and prevents centre-die-out.

Deadhead by cutting flower stems to a lateral shoot or down to the basal rosette. In autumn, shear the remaining foliage to 10 cm. Divide congested clumps by lifting, splitting, and replanting healthy outer sections.