How to Fertilize Bieberstein's crocus 'Cassiope'?
Diluted crocus feed pre-bud and immediately after bloom fades

Bieberstein's crocus 'Cassiope' · Crocus speciosus 'Cassiope'
Plant 8-10cm deep in late summer in gritty, poor to moderately fertile, well-drained soil, in full sun; for more advice, see bulb cultivation
Diluted crocus feed pre-bud and immediately after bloom fades