Acanthus carduaceus prefers consistently moist soil, especially during its active growing season. Water thoroughly when the top 2-3 cm of soil feels dry.

Reduce watering in winter, allowing the soil to dry out more between waterings to prevent root rot. Ensure good drainage to avoid waterlogging.

Prune Acanthus carduaceus after flowering to maintain shape and encourage a second bloom. Remove spent flower stalks at the base.

In late autumn or early winter, cut back all foliage to the ground to prepare for winter dormancy and prevent disease. This also tidies the appearance.

Propagate Acanthus carduaceus by root cuttings or division. In early spring, carefully divide established clumps, ensuring each section has healthy roots.

Alternatively, take root cuttings in late winter; plant them in well-draining potting mix and keep them warm and moist until new growth appears.

Repot Acanthus carduaceus every 2-3 years, or when it becomes root-bound. The best time to repot is in early spring before new growth begins. Use a well-draining potting mix.

Choose a pot that is only slightly larger than the current one to avoid excessive moisture retention.