twisted shell flower

Grow in deep fertile, moist soil in partial shade or sun. Tolerant of heavy clay soil, may also be grown in a bog garden; apply a deep mulch of organic matter in mid-spring

Deadhead flower spikes as they fade

Propagate by seed sown in containers in a cold frame in early spring; by division in spring; root soft tip cuttings in late spring or early summer

Susceptible to damage from slugs and snails

Generally disease free