Sea kale prefers consistent moisture, especially during establishment and dry periods. Water deeply at the base of the plant, allowing the soil to dry slightly between waterings.

Avoid waterlogging, as this can lead to root rot. In coastal or windy areas, it may require more frequent watering.

Pruning primarily involves removing dead or damaged foliage in late winter or early spring before new growth begins. Some gardeners may choose to cut back flower stalks after blooming to encourage vegetative growth.

Harvesting young shoots in spring is a form of pruning for culinary use.

Sea kale can be propagated by seed, sown in autumn or early spring. It can also be propagated by root cuttings taken in winter. For seeds, stratification may improve germination rates.

It is generally a robust plant that establishes well from both methods.

Sea kale is a perennial that is best left undisturbed in its permanent location once established. Repotting is generally not necessary unless growing young plants in containers.

If container-grown, repot in spring every 2-3 years into a larger pot with well-draining soil.