Fortunella japonica prefers consistently moist soil but dislikes waterlogged conditions. Water thoroughly when the top 2-3 cm of soil feels dry. Reduce watering slightly in winter when growth slows.

Ensure good drainage to prevent root rot, especially in containers.

Prune annually in late winter or early spring before new growth begins. Remove dead, damaged, or crossing branches to maintain an open canopy and encourage good air circulation.

Light pruning can also be done after fruiting to shape the plant and promote denser growth.

Seeds can be sown fresh, but germination is slow and may not produce true-to-type plants. A more reliable method is through grafting or air-layering, typically performed in spring.

This ensures faster fruiting and preserves the desired characteristics of the parent plant.

Repot young plants every 1-2 years, and mature plants every 3-5 years, preferably in spring. Use a well-draining potting mix designed for citrus or cacti.

Choose a pot that is only slightly larger than the current one to avoid overwatering issues and encourage healthy root development.