Why does your Euphorbia pulcherrima have sudden leaf drop? Diagnose the cause and fix it with our step-by-step guide.
Poinsettias are highly sensitive to cold drafts and sudden temperature fluctuations. Exposure to temperatures below 55°F (13°C) or being placed near air conditioning vents causes the plant to shed leaves rapidly as a stress response.
Excessive moisture in the substrate leads to anaerobic conditions and root decay. When roots rot, they can no longer transport water to the foliage, causing the plant to drop leaves as it effectively undergoes drought stress despite wet soil.
Poinsettias require bright, indirect light to maintain metabolic processes. A sudden move to a dark corner or significantly reduced photoperiod can trigger leaf abscission as the plant fails to support its existing biomass.
Poinsettias are extremely sensitive to ethylene gas, which is produced by ripening fruit or combustion. Exposure can cause rapid leaf senescence and drop.
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