Water regularly during the growing season, especially in dry spells, allowing the soil to dry out slightly between waterings. Reduce watering in autumn and winter.

Avoid waterlogged conditions, which can lead to root rot. Ensure good drainage to maintain healthy roots.

Deadhead spent flowers regularly to encourage further blooming. Cut back plants by about half in mid-summer if they become leggy or to promote a bushier habit and a second flush of flowers.

Remove any dead or diseased foliage promptly.

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

Alternatively, take stem cuttings in late spring or early summer and root them in moist soil or water.

Repot container-grown plants every 2-3 years in spring, moving them to a slightly larger pot with fresh, well-draining potting mix. This is primarily to refresh the soil and ensure adequate space for root growth.

Repotting also provides an opportunity to inspect the roots.