my night blooming 7 foot cereus, in the last few months; on about 3 feet of the top all those leaves have turned dark red?!!??

Question

Should I trim off these red leaves…like 3 feet of my plant?

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Answer 1

Darkening or black leaves on a cereus are not good, and can indicate the plant is dying, although not always. It also can mean too much sunlight. You should remove these darkened leaves and, just to be safe, take some cuttings from the healthy parts of the plant and root them in case the plant doesn't survive. Here's an article for that: https://www.gardeningknowhow.com/ornamental/cacti-succulents/night-blooming-cereus/night-blooming-cereus-cuttings.htm