How to Prune cautleya-flowered roscoea?
Remove faded flowers, the rest of the plant will die down naturally

cautleya-flowered roscoea · Roscoea cautleyoides
Grow in humus-rich, moderately fertile, moist but well-drained soil. A cool, sheltered site in partial shade is ideal; in very cold areas apply a deep winter mulch. If growing from a tuber, plant 15cm deep
Remove faded flowers, the rest of the plant will die down naturally