Water Acanthus caroli moderately during the growing season, allowing the soil to dry slightly between waterings.

Reduce watering significantly in autumn and winter to prevent root rot, especially if grown in cooler climates or containers. Ensure good drainage to avoid waterlogged conditions.

Prune Acanthus caroli after flowering to remove spent flower stalks and tidy the plant. In late winter or early spring, remove any dead or damaged foliage.

Cut back the plant to the ground if winter damage is severe, allowing new growth to emerge.

Propagate Acanthus caroli by division in early spring as new growth appears. Carefully separate healthy rhizomes, ensuring each piece has at least one bud.

Alternatively, seeds can be sown in autumn or spring, but germination can be slow and erratic.

Repot Acanthus caroli every 2-3 years, or when it becomes root-bound. Do this in early spring before new growth begins. Use a well-draining potting mix and a pot that allows for ample root space.

Handle the rhizomes gently to avoid damage.