Hernandia didymantha prefers consistently moist soil. Water thoroughly when the top 2-3 cm of soil feels dry. Avoid waterlogging, as this can lead to root rot.

Reduce watering slightly during cooler months, but never allow the soil to dry out completely. Ensure good drainage in the pot.

Pruning is generally minimal for Hernandia didymantha. Remove any dead, damaged, or crossing branches as needed to maintain shape and health. Light pruning can be done in spring to encourage bushier growth.

Avoid heavy pruning, as it can stress the plant.

Propagation is typically done from seeds, which require stratification. Cuttings can also be taken from semi-hardwood in summer. Ensure cuttings have a few leaves and are planted in a well-draining medium.

Maintain high humidity and warmth for successful rooting.

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

Choose a pot only slightly larger than the current one to avoid overwatering issues.