Water regularly during the growing season, keeping the soil consistently moist but not waterlogged. Reduce watering significantly in autumn and winter, allowing the soil to dry out between waterings to prevent root rot.

Ensure good drainage to avoid soggy conditions.

Deadhead spent flowers regularly to encourage more blooms and maintain a tidy appearance. In late autumn, after flowering has finished, cut back the stems to near ground level.

This helps to tidy the plant and prepare it for overwintering.

Chocolate Cosmos can be propagated from seed sown indoors in spring or by dividing tubers in spring before new growth emerges. Division is often the most successful method.

Ensure divisions have healthy roots and at least one viable bud.

Repot every 2-3 years in spring as needed, preferably into a slightly larger container with fresh, well-draining potting mix. Over-potting can lead to excess moisture retention.

Ensure the pot has adequate drainage holes.