Our 7ft high cactus has started to develop these brown patches & are definitely spreading. It’s located in a conservatory which is quite sunny but not direct & has been there for a number of years.
I’m sure it’s not water damage but I suppose it’s possible? Nothing has really changed environmentally for it.
We’ll be devastated if it perishes.
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Gary Gibbens
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A picture might help. Also, are any other plants in the area affected? – Boba Fit May 10 '23 at 12:19
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Picture added. Not really that ivf noticed. – Gary Gibbens May 11 '23 at 12:19
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There's a similar, but I think different, problem in [What are these brown spots on my cactus?](https://gardening.stackexchange.com/questions/31405/what-are-these-brown-spots-on-my-cactus) – Ray Butterworth May 11 '23 at 14:47
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This is about 4' high, and grown from seed in 1983.
I can't remember a time when it didn't have those brown marks.
Given that they were the only indoor plants I'd ever grown, it didn't occur to me until now that it might be unusual.
I can't guarantee it's the same condition as yours, but for mine it's certainly not been fatal so far.
Ray Butterworth
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This is not good. Most certainly because of carbon monoxide concentration being high in your surroundings. How good is your ventilation? Do members in your family tend to sneeze a lot in the morning?
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How did you diagnose CO poisoning for a plant? https://wgbis.ces.iisc.ac.in/energy/HC270799/HDL/ENV/enven/vol321.htm#:~:text=Plants%3A%20Carbon%20monoxide%20does%20not,which%20is%20used%20for%20photosynthesis.&text=ENVIRONMENTAL%20BEHAVIOUR-,Water%3A,the%20surface%20of%20the%20water. – Boba Fit May 10 '23 at 12:19
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Your answer could be improved with additional supporting information. Please [edit] to add further details, such as citations or documentation, so that others can confirm that your answer is correct. You can find more information on how to write good answers [in the help center](/help/how-to-answer). – Community May 10 '23 at 13:09
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CO levels inside a conservatory ? lLease post a reference or citation – Rohit Gupta May 11 '23 at 01:39