How to Prune English mace?
Cut back untidy foliage in spring; deadheading may encourage repeat flowering in the summer

English mace · Achillea ageratum
Also known as: flossflower; sweet maudlin; sweet milfoil; sweet Nancy; sweet yarrow
Grow in an open, sunny position in well-drained soil
Cut back untidy foliage in spring; deadheading may encourage repeat flowering in the summer