Forcing spring-flowering bulbs
Most spring-flowering bulbs need a period of chilling at 9°C or below, before you bring them indoors, to force them into growth. The chilling imitates the cold winter weather they would experience naturally, which is essential for proper flower development. The length of chilling varies between different types of bulb, but is generally somewhere between 10 and 16 weeks. However long the chilling period, a cold greenhouse, cold frame or porch really comes into its own for the next stage of the process, which involves forcing the bulbs into growth. The cool, bright conditions are ideal for bringing the bulbs on gradually. You can then bring them inside just as the flower buds begin to break, ready to fill your house with fragrance.