How to Prune Hippeastrum 'Sumatra'?
No pruning required

Hippeastrum 'Sumatra' · Hippeastrum 'Sumatra'
Plant bulbs in autumn in loam-based potting compost with the neck and shoulders above the soil surface. Place in bright filtered or full light and water sparingly until in active growth, then water freely and apply a dilute, balanced liquid fertiliser every 2 weeks. After flowering reduce watering as the leaves die off; keep dry when dormant. Pot on every 3-5 years in autumn. See hippeastrum cultivation for further information
No pruning required