Agathis borneensis prefers consistently moist soil but dislikes waterlogged conditions. Water deeply when the top 2-3 cm of soil feels dry.

Reduce watering slightly during cooler months, but ensure the soil does not completely dry out. Proper drainage is crucial to prevent root rot.

Pruning for Agathis borneensis is typically minimal and mainly for shaping or removing dead or damaged branches. If necessary, prune in late winter or early spring before new growth begins.

Make clean cuts to promote healing and prevent disease entry.

Propagation is primarily done through seeds, which require stratification. Scarification may also be necessary. Cuttings are more challenging but can be attempted from semi-hardwood material in summer.

Success rates can be variable, so patience is key.

Repotting is usually only necessary for young, container-grown specimens when they become root-bound, typically every 2-3 years. Use a well-draining potting mix.

For larger, established trees in the landscape, repotting is not recommended.