Bill Shoemaker wshoemak at
Mon Apr 15 08:46:55 EDT 2002

>    I would say yes. The more light a plant has the better. The only
>exception to this is plants that require darkness to flower, i.e.:

Plants actually have a need for darkness. It doesn't have to be 12 or even 8
hours per night but certain physiological processes are dark-oriented. I
think it would be fine to supplement natural light so that the plants have
14-16 hours of light per day. But I wouldn't run it more than that. Besides,
it costs something to run those things that long. You want something back in

Bill Shoemaker
Sr Research Specialist, Food Crops
Univ of Illinois - St Charles Hort Research Center

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