Can be allowed to flower indoors before planting. This will not affect next years flowers.
Advice & Tips:
Crocus will grow in a wide range of soils provided there is good drainage.
Plant immediately after purchase in the autumn and you will be rewarded with flowers within a few weeks. The foliage emerges in spring and its vigorous growth will encourage next years flowers. Excellent for naturalising (leaving in for flowers year after year) in wild garden, rockeries and between shrubs
Should they become overcrowded after a few years, lift when the foliage has died down, divide and replant