Why Your Cereus peruvianus Is Bending at the Top

John's 11-year-old, 5-foot Cereus peruvianus (6-sided, green lower stem, blue top) had the top foot bend over suddenly. He asked if this was normal.

Greg confirmed the ID and said bending is not normal. The most likely cause is insufficient light—common when a plant nears a ceiling. The secondary cause is underwatering, but 11 years of care made that unlikely.

He suggested propping the top and moving the plant to a brighter spot, ideally under a skylight.

Fixing Etiolation

• Gradually increase light exposure.
• Rotate plant regularly for even growth.
• Stake the bent section until it stiffens.
• Water deeply but infrequently.