Alstonia boonei prefers consistently moist soil but dislikes waterlogged conditions. Water thoroughly when the top 2-3 cm of soil feels dry.

Reduce watering slightly in cooler months, allowing the soil to dry out a bit more between waterings. Ensure good drainage to prevent root rot.

Prune Alstonia boonei to maintain desired shape and size, or to remove any dead, damaged, or crossing branches. Light pruning can be done any time of year.

For more significant shaping, prune in late winter or early spring before new growth begins. Use clean, sharp tools.

Propagation is typically done by semi-hardwood cuttings taken in summer. Select healthy stems, make a clean cut below a node, and dip the cut end in rooting hormone.

Plant in a well-draining potting mix and keep humid and warm. Germination from seed is also possible but less common.

Repot young Alstonia boonei plants every 1-2 years, or when they become root-bound. Mature plants can be repotted less frequently, perhaps every 3-4 years. Use a well-draining potting mix.

Repot in spring before the active growing season begins to minimize transplant shock.