At its best:
Plant the saffron crocus bulbs in late summer, in pots or borders, in a warm, sunny spot. Space them 15cm apart, at a depth of about 10cm, then firm down the soil and water in well.
When the crocuses flower in autumn, harvest the saffron strands by removing the long, bright orange-red stigmas from the centre of the flowers using tweezers. Each flower produces just three stigmas, so harvest them carefully.