Koyamaki prefers consistent moisture, especially when young. Water deeply when the top 2-3 cm of soil feels dry. Avoid waterlogging, as this can lead to root rot. Reduce watering frequency in winter when growth slows.

Established trees are more drought-tolerant but benefit from occasional deep watering during prolonged dry spells.

Pruning is generally minimal for Sciadopitys verticillata, as it forms an attractive natural shape. Remove dead, damaged, or crossing branches at any time.

Light shaping can be done in late winter or early spring before new growth begins. Avoid heavy pruning, as it can be slow to recover and may result in unsightly scars.

Propagation is typically done from seed, which requires a period of cold stratification. Cuttings can be taken from semi-hardwood in summer, but rooting is often slow and difficult.

Grafting onto rootstock is a more reliable method for specific cultivars, often performed by specialists in late winter.

Repot young plants every 2-3 years in spring before active growth begins. Use a well-draining potting mix. For mature trees, repotting is rarely necessary and can be disruptive.

If repotting is essential, do so in early spring, minimizing root disturbance. Ensure the new container is only slightly larger than the current one.