Cactus Tip Rot?

5 years ago

last modified: 5 years ago

Hello,

Ive had a large 6 ft cereus peruvius cactus for about a year now. Today I noticed that one of the tips started to show black rot. Im in Texas, and we had a 3 day power outage last week that probably caused my house to get very cold. I watered it one time in early February and I haven't in 2-3 months prior. It is potted with Al's gritty mix. It is next to a large window and I use a plant light on it too. What could have caused this? The cold or a fungal infection or overwatering? I see on it there is these small spots. I removed the black rot and cut 2 inches below it with a sterilized scissors.

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Comments (3)

SoCal Stewart (San Diego, Ca Zone 10A/10B)
5 years ago
Yes, I saw the weather there was very cold & the power outage with people saying it was 40 degrees inside their homes. I don’t have this plant & don’t know about their cold tolerances. How cold do you think it got inside your home?
Lora Moore
Original Author
5 years ago
Thank you for the response! I left after the first day, so I am not too sure but the power didn't come on for 3 days straight. It was probably 40-50s. It was a low of -1 outside. I guess my biggest question is if cacti can get tip rot from consistent cold weather, or if it could be fungal in origin. :/ I dont see any signs of root rot.

Unfortunately I forgot a smaller similar cactus outside and it died from the weather change but it was an all over rot.
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SoCal Stewart (San Diego, Ca Zone 10A/10B)
5 years ago
There are a lot of knowledgeable people on this forum whom I’m sure have experience with this particular cactus and will reply soon .