Plant in sunny borders in fertile, moist but well-drained soil, watering regularly while they establish. These hardy perennials die back in winter and re-emerge in spring. Cut old stems down to ground level in late autumn or early spring to keep the plants tidy, and divide congested clumps every few years to maintain vigour.

Apply a light mulch in winter to protect roots and retain moisture. They pair well with ornamental grasses and late-flowering perennials, and tolerating occasional dry periods once established.