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  • What is long-day flowering?

    • Copyright 1999, National Gardening Association. All Rights Reserved. Every plant for which flower initiation is light-dependent (and not all plants are) has a critical day-length associated with it. The term long-day describes plants that begin forming flower buds when the days are longer than their critical day length.

  • What are the long day and short day plants?

    • Long-day and short-day plants. Two familiar short-day plants are chrysanthemum and poinsettia. These plants will initiate flowers when the day lengths are shorter than their critical day length: Chrysanthemum (some types) critical day length: 15 hrs. Poinsettia critical day length: 10 hrs.

  • Which plants initiate flowers when the day length is longer?

    • Both these plants will initiate flowers when the day lengths are longer than their particular critical day length: Dill critical day length: 11 hrs. Spinach (some types) critical day length: 13 hrs. Two familiar short-day plants are chrysanthemum and poinsettia.

  • What is the critical period for long-day plants?

    • Long-day plants are also called as Short-night Plants. Short-day plants usually flower in the early spring or autumn. Long-day plants flower in the spring or early summer. The continuous dark period is the critical period for short-day plants. Continuous day period is the critical period for long-day plants.