At which temperatures do poinsettias rot?

At temperatures of 55 degrees F/12.78 degrees Cpoinsettias (Euphorbia pulcherrima) are in danger of root and stem rot.

Specifically, the temperature should not fall below 60 degrees F/15.56 degrees C. But the danger of rot is highest a bit lower than this lower limit of the temperature range in which to keep poinsettias. The upper limit tends to be 80 degrees F/26.67 degrees C. Cooler temperatures often are accompanied by drying conditions. Poinsettias do not favor cold, drought or waterlogging.