Barrel cactus problem

I have noticed the skin at the bottom of my barrel cactus is starting to yellow and wrinkled. The cactus receives morning sun only, as it sits by a window facing east. I water it about once a month in winter months and bring it outside in summer months. I fear it is starting to rot and eventually die. What am I doing wrong?

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1 Comment To "Barrel cactus problem"

#1 Comment By Downtoearthdigs On 02/26/2017 @ 8:18 am

Your Cactus may be suffering from root rot.

You can try lifting the cactus and repotting in a sterile cactus soil mix.
Here is a link with more information.

https://www.gardeningknowhow.com/ornamental/cacti-succulents/scgen/cactus-going-soft.htm ^[1]

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