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Which temperatures are life-threatening to poinsettias?

Updated: 8/16/2019
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50 degrees 50 degrees
50 degrees

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Q: Which temperatures are life-threatening to poinsettias?
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What is the best temperature for storing poinsettias?

Sixty (60) degrees F/15.56 degrees C is the best temperature at which to store poinsettias (Euphorbia pulcherrima).Specifically, warmer temperatures or lower temperatures may be drying to the heat-, light- and moisture-sensitive plant. Additionally, lower temperatures raise the real possibility of rot setting in. Poinsettias do not tolerate root and stem rot.


How much cold can a poinsettia withhold?

No, poinsettias (Euphorbia pulcherrima) cannot tolerate cold.Specifically, poinsettias are native to semi-tropical and tropical areas of Latin America. They tend to prefer a temperature range of 60-80 degrees F/15.56-26.67 degrees C. Once temperatures drop below 60 degrees F/15.56 degrees C, poinsettias become susceptible to the black rot of Thielaviopsis basicole. When temperatures drop down to 55 degrees F/12.78 degrees C, poinsettias will find their flowering affected. When temperatures drop even further to 50 degrees C/10 degrees C, poinsettias suffer irreversible injury.


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.


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