One of my cactus turned red at its base about a year ago and it has since spread upwards. Some websites say it is a natural ageing process but I doubt so because it is still so small! Now another of my bigger cactus has turned red at its base! Please advise.
First picture attached refers to my first cactus that turned red. Second one is the one that I just noticed turning red. The third one has got a band of beige at its base. When I try to scrape it, nothing happens.
The red parts are very hard, just as turgid as the green parts. I did not notice any rotting at the base. All my cacti feel turgid still, including the base.
[Second cactus that turned red