How to Prune clamshell orchid?
No pruning required; remove spent flowers as necessary

clamshell orchid · Prosthechea cochleata
Also known as: cockle orchid
Grow in an open epiphytic compost with bright filtered light, and when in active growth during spring and summer, water sparingly but regularly and apply orchid fertiliser at every third or fourth watering; keep dry in winter
No pruning required; remove spent flowers as necessary