Leaving the lights off for one 18-hour period will have no significant effect on the plants. They will continue to grow vegetatively and will lose only 18 hours of photosynthesis so their growth is set back a little less than a day.
Readers with grow questions (or answers) should send them to Ed at: Ask Ed, PMB 147, 530 Divisadero St., San Francisco, California 94117, USA
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