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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14.1 General soil treatment: Steaming In order to revitalize the soil in standing ground and greenhouses, and rooting medium that has been used before, and to reduce the risk of diseases such as Botrytis cinerea and Pythium, it is advisable to apply steam treat-ment. Steaming means heating the soil down to a depth of 25-30 cm for at least an hour at 70-80°C. This will destroy most soil diseases, with the exception of Pythium which must have additional chemical treatment. Steaming is best done with underpressure. In muddy soil with a low pH steaming may lead to damaging levels of magnesium.