Water regularly during the growing season, allowing the soil to dry slightly between waterings. Reduce watering in winter. Ensure good drainage to prevent waterlogging, which can lead to root rot.

Overwatering is a common mistake; err on the side of slightly dry rather than constantly wet.

Prune lightly after flowering to maintain a tidy shape and encourage bushier growth. Remove spent flower stalks to promote continuous blooming and prevent seed formation.

Harder pruning can be done in early spring before new growth begins to rejuvenate overgrown plants.

Propagate from softwood cuttings taken in late spring or semi-hardwood cuttings in mid-summer. Root cuttings in a well-draining potting mix in a warm location.

Alternatively, sow seeds in spring under glass or in a cold frame. Division of established clumps is also effective in spring.

Repot young plants annually in spring into slightly larger containers. Mature plants can be repotted every 2-3 years or when they become root-bound. Use a free-draining potting compost, such as a mix of peat and grit.

Ensure the new pot has adequate drainage holes.