The Q&A Archives: Light Requirements for Seedlings

Question: I have heard different opinions about the number of hours of light to provide seedlings. All my seedlings are beyond the first set of true leaves phase. I have them under grow lights 12-14 hours daily. I have heard that you could give them 24 hour light, no periods of darkness. How would this affect their growth? Angela Mager Richmond, TX

Answer: Keeping the lights on 24-hours a day is even a bit much for seedlings. They need a rest too. The growth will actually stunt and slow down. The lights should be on 14-16 hours a day. If you want to slow their growth a bit, reduce it to 10-12 hours, but no less.

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