In this section, you will find the growing methods in use, the growing techniques, crop protection, disease control and variety choice of tulips, hyacinths and narcissus.

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4.1 Cooling: Introduction The duration of the cold treatment (see Forcing in trays) depends on the cultivar and the time scheduled for housing the bulbs. The Manual Part 1 published by the International Bulb Flower Centre sets out the duration of the cold treatment per scheduled housing date for a range of cultivars. The cold may be given to the bulbs either as a combined treatment (whereby the narcissi bulbs receive the cold treatment as dry bulbs (dry cooling) and the remainder after) or entirely after planting (wet cooling).