long day

long-day

[lawng-dey, long-]
adjective Botany.
requiring a long photoperiod in order to flower.

Origin:
1915–20

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World English Dictionary
long-day
 
adj
Compare short-day (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

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