Agathis australis prefers consistently moist soil, especially when young. Water deeply and regularly during dry periods, allowing the top few centimeters of soil to dry out between waterings.

Avoid waterlogging, which can lead to root rot. Reduce watering in cooler months.

Pruning is typically minimal for Agathis australis, mainly focusing on removing dead, damaged, or crossing branches. If shaping is desired for very young specimens, do so cautiously.

Avoid heavy pruning, as it can stress the tree and affect its natural form. Best done in late winter or early spring.

Propagation is primarily through seed, which requires stratification. Seeds are best sown fresh. Cuttings can be attempted but are notoriously difficult to root. Patience is key, as Kauri is a slow-growing species.

Germination can be erratic and take several months to over a year.

Repotting is rarely necessary for Agathis australis as it is a large, long-lived tree. If grown in a container, choose a very large pot and repot only when root-bound, typically every 3-5 years.

Use a well-draining, slightly acidic soil mix. Repot in spring.