Agathis alba prefers consistently moist soil but can tolerate short dry periods once established. Water deeply when the top 2-3 cm of soil feels dry. Avoid waterlogged conditions, which can lead to root rot.

Reduce watering slightly during cooler months, allowing the soil to dry out a bit more between waterings.

Pruning is generally minimal for Agathis alba, mainly to remove dead, damaged, or crossing branches. This can be done at any time of year.

If shaping is desired for aesthetic reasons, make clean cuts just above a branch whorl. Avoid heavy pruning, as it can stress the tree and affect its natural form.

Propagation is typically done through seeds, which require stratification to germinate. Sow seeds in a well-draining, moist medium and keep them at a consistent temperature.

Cuttings are more challenging to root but can be attempted from semi-hardwood cuttings taken in late summer, using a rooting hormone.

Repotting is rarely necessary for mature Agathis alba as they are slow-growing and develop extensive root systems.

Young plants in containers should be repotted every 2-3 years into a slightly larger pot with well-draining soil mix. Repotting is best done in spring before active growth begins.