Crambe cordifolia prefers consistently moist soil but can tolerate some dryness once established. Water deeply when the top 5-7 cm of soil feels dry. Avoid waterlogging, which can lead to root rot.

Reduce watering in winter, especially if grown in cooler climates.

Pruning is primarily done after flowering to maintain shape or if the plant becomes overgrown. Cut back stems to the ground in late autumn or early spring before new growth appears.

Remove any dead or damaged foliage as needed throughout the growing season.

Crambe cordifolia can be propagated by seeds sown in autumn or early spring, either directly outdoors or in a cold frame.

Division of established clumps is also effective, best carried out in early spring as new growth emerges. Ensure good air circulation for seedlings.

Repotting is typically not necessary for Crambe cordifolia as it is a large, long-lived perennial that prefers to be undisturbed.

If it becomes necessary due to overcrowding or root issues, transplant in early spring before active growth begins. Ensure the new location has adequate space.