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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 is the difference between short day and long day plants?

  • Short-day plants are also called as Long-night 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.

  • 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 are long-day and day-neutral plants?

  • Long-day plants bloom when there is more than a critical length of sunlight and are those plants that you see flower in the summer. Day-neutral plants are not affected by the length of the sunlight and may bloom throughout the spring, summer and fall. To unlock this lesson you must be a Member.