Water regularly, especially during dry spells, to keep the soil consistently moist but not waterlogged. Allow the top few centimeters of soil to dry out between waterings.

In very hot weather, increase watering frequency to prevent wilting and maintain good growth.

Deadhead spent flower spikes to encourage further blooming and prevent self-seeding. In late autumn or early spring, remove any dead or damaged foliage to tidy the plant and prepare it for new growth.

Cut back any leggy stems to maintain a compact shape.

Propagate by dividing established clumps in spring or autumn. Alternatively, sow seeds in autumn or early spring, either directly outdoors or in a cold frame.

Stem cuttings can also be taken in late spring or early summer and rooted in moist, well-drained soil.

Repot young plants annually or as needed to provide fresh soil and adequate space for root growth, typically in spring. Established plants rarely need repotting and can become quite pot-bound, which can be beneficial for encouraging flowering.