How to Prune Cretan arum?
No pruning required

Cretan arum · Arum creticum
Plant tubers 10-15cm deep in autumn or spring in moist but well-drained, humus-rich soil. Leaves are larger in partial shade, flowering is better in sun. New leaves emerge in autumn. Will be evergreen in warm climates, deciduous in cold climates.
No pruning required