The effects of day temperature (DT), night (NT), and length (NL) were evaluated on the flowering responses heat-tolerant heat-sensitive poinsettia ( Euphorbia pulcherrima Willd. ex Klotzsch) cultivars Orion Red Prestige Red, respectively. Plants placed under 60 DT × NT NL treatments that consisted three (20, 24, 28 °C), four (16, 20, five (10, 11, 12, 13, 14 hours) for first 17 days experiment....