Water Alstonia venenata moderately, allowing the soil to dry slightly between waterings. Avoid overwatering, which can lead to root rot. In drier climates or during hot periods, increase watering frequency.

Ensure good drainage to prevent waterlogged conditions.

Prune Venenous Alstonia to maintain its shape and size, and to remove any dead or diseased branches.

Light pruning can be done at any time, but heavier pruning is best performed in late winter or early spring before new growth begins. Use clean, sharp tools.

Propagate Alstonia venenata from semi-hardwood cuttings taken in summer. Dip the cuttings in rooting hormone and plant them in a well-draining medium.

Keep the cuttings moist and in a warm, humid environment until roots form. This method offers a good success rate.

Repot Alstonia venenata every 2-3 years or when it becomes root-bound. Use a well-draining potting mix. Repotting is best done in spring before the active growth season.

Choose a pot that is slightly larger than the current one to accommodate root growth.