How to Prune yarrow 'Credo'?
Cut back untidy foliage in spring; deadheading may encourage repeat flowering in the summer

yarrow 'Credo' · Achillea 'Credo'
An open sunny position in a moist but well-drained soil is best, but it will tolerate most situations apart from heavy, wet clay
Cut back untidy foliage in spring; deadheading may encourage repeat flowering in the summer