Abstract
Over 3 years, greenhouse and phytotron trials were conducted using Israeli-grown Leucojum aestivum. The objective was to evaluate the potential of this bulb as a potted plant for North American forcing. It was found that bulb sizes of 12/14, 14/16, and 16/up cm (in circumference) produced quality plants. Bulbs of 10/12 cm had reduced number of florets per floral stalk. The optimal cold requirement was 15-19 weeks. The major physiological disorder associated with forcing was flower abortion. Phytotron studies showed that this occurred readily at 30/26 C (Day/Night temperatures) and was minimal at 18/14 C. When > 12 cm bulbs were properly programmed and forced in the greenhouse, they produced plants that were 25-35 cm tall at flowering, with 1-2 floral stalks and 4-6 florets per stalk. No plant growth retardants are required for forcing this bulb as a 15 cm diameter potted plant.
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