Plentiful Poinsettias without PGRs (IMAGE) American Society for Horticultural Science Caption This photo shows poinsettia plants cultivated under a photoselective (left) and a transparent (right) film. Credit Photo by Diego Mata Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.