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Best answer

Spring or early summer, before the equinox

People also ask

  • 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.

  • 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.

  • 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.

  • Do flowers bloom on different days of the week?

    • And some plants form flowers regardless of day length. Botanists call these day neutral plants. Tomatoes, corn, cucumbers and some strawberries are day-neutral. Some plants, such as petunias defy categorization, said VanDerZanden. They flower regardless of day length, but flower earlier and more profusely with long days, she said.