Do plants know what time it is

Red Eye Jim

Active Member
This may be a bit of a smoked up question. I have my timers to start at 10pm and turn off at 4pm. 18 hours in veg growth. This means grow box is off and quiet during busiest part of day.

This will not effect them growing will it versus regular sunlight growing hours?
 
They only know the day time you give them. I'm flowering right now 6 pm to 6 am is my day time.
 
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