Obviously, this post is 5 years old but maybe my answer will help someone else dealing with the same tree.
The Cherimoya tree (Annona cherimola) thrives in the high-altitude regions of South America. It has been cherished for centuries for its unique flavor, a blend of banana, pineapple, and strawberry.
Over time, people have naturalized it in various parts of the world, including the Mediterranean, Asia, and the United States.
Pruning and Training
Aesthetic Pruning Considerations
Prune Cherimoya trees annually in late winter to maintain shape and remove dead or diseased wood. This helps improve airflow and sunlight penetration.
Espalier Training Potential
Cherimoya trees can be trained as espaliers, which is useful for small spaces. This method involves training the branches to grow flat against a structure, such as a wall or fence.
This is a short excerpt from my article on the cherimoya tree care I have published on my Blog Gardenfrontier.