Most plants grow best when exposed to 16-18 hrs of light per day. Additional hours of light during the day have not been found to increase growth by any significant amount. Plants that exhibit photoperiodism, the trait that causes daylength to trigger flowering, should be exposed to 12-14 hours of light once flowering is desired. Total darkness is required during the darkness cycle for flowers and fruit to form correctly. Select a timer to control the duration of HID light. Some popular plants that are frequently grown indoors and exhibit "photoperiodism are Chrysanthemums, Poinsettias, Bromeliads, Pansies, Gibsofilia, Fuschi, Petunia, Gladiolia and Roses. These plants will flower when their photoperiod is 12hrs. of light and 12hrs. of darkness. Using indoor lights and a timer, you can force flower them during market peaks to increase yields and provide on-time delivery to market.
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