Water regularly during the growing season, keeping the soil consistently moist but not waterlogged. Reduce watering in autumn and winter to allow the soil to dry slightly between waterings.

Ensure good drainage to prevent root rot.

Prune after flowering to maintain shape and remove spent flower stalks. Remove any dead, damaged, or diseased stems at any time. Pruning can also be done in late winter or early spring to remove frost-damaged growth.

Propagate from seed sown in autumn or early spring. Seeds may require a period of cold stratification. Division of established clumps in spring is another effective method for propagation.

Repot young plants annually in spring. Mature plants can be repotted every 2-3 years or when root-bound. Use a well-draining potting mix and a pot that allows for adequate root growth.