Abstract
Abstract The effects of a 63° period of development prior to cooling on the forcing of Lilium longiflorum were compared with precooling treatments. Different bulb sizes of ‘Ace’ and ‘Nellie White’ lilies were used. It was found that a growing period at 63° prior to cooling significantly increased the number of leaves and floral buds. It had no consistent effect on the number of days to flower or final plant height. With the ‘Ace’ lily, the greatest number of floral buds was observed with a treatment of 3 weeks at 63° followed by 5 weeks at 38°. Within a single bulb size, the ‘Ace’ lily produced more floral buds, was a taller plant, and had more leaves than ‘Nellie White’. The number of leaves and floral buds increased with an increase in bulb size regardless of the type of low temperature treatment or cultivar used.
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