How to Propagate long-flowered crocus?
Propagate by seed sown in containers in a cold frame when ripe or remove cormlets when dormant

long-flowered crocus · Crocus longiflorus
Grow in a bulb frame or alpine house in a mix of equal parts loam, leaf mould and sharp sand or grit. Water freely in the growing season and apply a low-nitrogen fertiliser monthly. Keep completely dry in summer dormancy
Propagate by seed sown in containers in a cold frame when ripe or remove cormlets when dormant