Jag antar att det trots allt inte är så himla exakt vetenskap. Men nog lär det (i alla fall här) vara under 5.5 grader celcius i marken ett tag framöver, och även om det inte blir 12 veckor (3 månader) kanske det räcker?
Citerar en text om köldbehandling av Jonnie Lazarus: The cold treatment for tulips is an imitation of winter, during which starch, stored in the bulb scales as a food reserve is changed into sugars. These sugars, in turn, serve for food for the plant that is being formed. In principle, the tulip bulb has stored so much food that it only needs water to be able to create a new plant. The cold treatment given the bulbs ensures that when the tulip is actually forced into bloom, the flower stalk will be tall enough. Besides encouraging the growth of the stem, this ‘winter’ also has a definite influence on the crops rate of growth when being forced in the greenhouse or home. The temperature provided during the cold treatment is about 42 degrees F. The duration depends on the cultivar and when you want the bulbs to come into bloom. Each cultivar has its own requirements for cold and it varies from about 12 to 20 weeks. If given a cold period that is not long enough the tulips remain too short.
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Temptations come, as a general rule, when they are sought. -Margaret Oliphant -------------------- zon 5
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