How to Prune early crocus 'Roseus'?
No pruning required

early crocus 'Roseus' · Crocus tommasinianus 'Roseus'
Plant 8-10cm deep in autumn in gritty, poor to moderately fertile, well-drained soil, in full sun; C. tommasinianus and its forms increase freely, and are suitable for naturalizing in grass; for more advice, see bulb cultivation
No pruning required