How to Fertilize Bory crocus?
Apply a low-nitrogen bulb fertilizer in early spring as growth begins.

Bory crocus · Crocus boryi
Plant 8-10cm deep in late summer in full light in a bulb frame or alpine house, in a mix of equal parts loam, leaf mould, and grit or sharp sand; in the growing season, water freely and apply a low-nitrogen fertilizer monthly, but in summer when dormant keep completely dry; for more advice, see bulb cultivation
Apply a low-nitrogen bulb fertilizer in early spring as growth begins.