Water moderately during the growing season, allowing the soil to dry out slightly between waterings. Reduce watering in autumn and winter to prevent waterlogged conditions, especially in colder climates.

Ensure good drainage to avoid root rot.

Deadhead spent flowers regularly to encourage continuous blooming and maintain a tidy appearance.

Cut back the plant by about one-third after the main flowering period to promote bushier growth and prevent excessive self-seeding. Remove any dead or diseased stems in early spring.

Propagate by division in early spring or autumn. Carefully lift the plant and divide the root ball into sections, ensuring each division has healthy roots and shoots.

Replant divisions immediately into well-draining soil. Stem cuttings can also be taken in late spring.

Repot established plants every 2-3 years, preferably in spring, if they become root-bound or the soil quality has degraded. Choose a pot with adequate drainage holes and use a well-draining potting mix.

This also provides an opportunity to divide the plant.