How to Prune carnation tree?
No pruning required

carnation tree · Kleinia neriifolia
Grow in a free-draining, loam-based compost with extra grit, in full light and with good ventilation. Water moderately when in growth. Containers may be placed outdoors in summer but plants will not tolerate frost. Plants may lose leaves in summer, this is an adaptation to limit water loss in the dry season. See houseplant cacti and succulent cultivation
No pruning required