Water Annona jahnii thoroughly when the top 2-3 cm of soil feels dry. Avoid waterlogging, as this can lead to root rot. Reduce watering in cooler months and during dormancy periods.

Ensure good drainage to prevent excess moisture retention.

Prune Annona jahnii to maintain shape, remove dead or diseased branches, and improve air circulation. Light pruning can be done after fruiting.

For established trees, more significant pruning can be undertaken in late winter or early spring before new growth begins.

Propagation is typically done by seed, grafting, or air-layering. Seeds require stratification and can be slow to germinate. Grafting is often preferred for faster fruiting and to maintain desirable traits.

Air-layering can also be successful in humid environments.

Repot young Annona jahnii plants every 1-2 years in spring, or when root-bound. Use a well-draining potting mix.

For mature plants, repotting may be less frequent, and it's often sufficient to top-dress with fresh soil annually. Ensure the new pot is only slightly larger.