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Pencil Cactus (Euphorbia tirucalli) Stem Drop: Water, Light, Pests

9-mo pencil cactus dropping brown stems in east window. Three suspects:

Key

If in original pot, watering is prime suspect. East window okay if unobstructed.

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CauseCheckFix
WateringSame pot? Water every 2–3 wks, thoroughly. No standing water.Adjust frequency. Deep soak when dry.
LightRight in front of east window, uncovered all day?Maximize exposure.
PestsMealybugs (white cotton) or scale (brown bumps + sticky)?Alcohol swabs or neem oil.