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Optimum temperature and duration of low-temperature treatment for forcing tulips

Acta Horticulturae (47): 201-208

Optimum temperature and duration of low-temperature treatment for forcing tulips

The optimum cooling temperature needed for early-forced tulip bulbs differs between countries. In trials both Dutch and Japanese bulbs of the cvs Paul Richter and William Pitt were given either the standard Japanese treatment of 15 deg C for 2 weeks + 2 deg for 7-8 weeks or the Dutch "five-degree" treatment of 17 deg for 2 weeks + 5 deg for 9 weeks.

Accession: 000449943

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Inaba, K.; Asano, A., 1974: Studies on forcing tulips, cv. William Pitt. The optimum night temperature for Christmas flowering. Plants were subjected to various night temperature treatments from sprouting to anthesis with the day temperature held at 25 deg C. For early flowering, temperatures of 20 or 22 deg were more effective than lower ones at most stages after sproutin...

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