Abstract
Abstract Thirty-eight cultivars of Chrysanthemum × morifolium Ramat. commonly grown in year-round flower production programs were grown continuously in long days. After 19 weeks of growth, 2 apparently were still vegetative, whereas 36 had formed flower buds; these failed to develop to anthesis and formed “crown buds”. The average number of leaves produced before the terminal flower bud (“long-day leaf number,” LDLN) ranged from 18.8 for ‘Bright Golden Anne’ to 78.2 for ‘Dignity.’ LDLN indicates whether a cultivar will form flower buds relatively early while growing in long days, and it identifies cultivars that need special attention during cutting production. It also could be used to control flowering in “timed-pinch” programs, and to characterize cultivars for breeding programs.
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