Ensure good drainage when planting as the plant can die back in heavy, poorly-drained soil. Give it space to spread out.

Cut any rare flowering stems back to ground level in autumn and apply a generous mulch of well-rotted garden compost or manure around the base of the plant.

Divide large clumps in early spring. Once established it’s reasonably drought tolerant, so will be happy in a dry, sunny site, or gravel garden.