Optimum Supplemental LED Intensity for Cut Gerbera

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This study sought to determine the optimum light level for cut “Ultima” gerbera production during the 2015-16 supplemental lighting season (ie. Nov. to Mar) at higher latitudes. We compared stem length, number of leaves, times to first flower, time to harvest, fresh mass of harvested flower, flower diameter, and stem length under 40, 75, 135, 170 & 180 μmol·m-2·s-1 of LED light.

Download the full study to learn how to achieve:

  • Reduced leaf size
  • Decreased time for first flower
  • Shorter time to harvest

Poster Session presented at American Society for Horticultural Science Annual Conference, 2016, in Atlanta, Georgia


  • David Llewellyn, University of Guelph, Guelph, Ontario, Canada
  • Katie Vinson, University of Guelph, Guelph, Ontario, Canada
  • Dr. Youbin Zheng, University of Guelph, Guelph, Ontario, Canada

Special Thanks

International Cut Flower Growers Association, Joseph H. Hill Memorial Foundation, Inc., Rosa Flora

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