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long-day

[ lawng-dey, long- ]

adjective

Botany.
  1. requiring a long photoperiod in order to flower.


long-day

adjective

  1. (of certain plants) able to mature and flower only if exposed to long periods of daylight (more than 12 hours), each followed by a shorter period of darkness Compare short-day
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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yvlog History and Origins

Origin of long-day1

First recorded in 1915–20
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Example Sentences

Examples have not been reviewed.

In the South, where onions are typically sown in the fall and transplanted to harvest in late spring, short-day varieties are the choice; in the Northeast, where bulb formation happens in the summer from spring transplants, long-day varieties are indicated.

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To a good approximation, Saturday ended the annual long-day season.

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Long-day onions bulb when day length reaches 14 hours or more.

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If you’re gardening north of 40 degrees North latitude, be sure to choose long-day onions.

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Long-day cultivars — American summer berries — are, he said, “optimized for mass production,” at the expense of flavor.

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