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I think your cactus has rot, and it will spread to the unaffected ones if you don't take action. I would separate the affected one from the two healthy ones, to prevent spreading. The one that is affected can be saved by cutting off the upper part (which is still healthy green), and try to let it grow roots (propagation by cuttings). While you are cutting, ...


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Yes, Your cactus is a Pilosocereus chrysostele; There are many cacti which are similar in appearance, and P. chrysostele is a popular variety: They're robust and attractive. Maybe carefully check how yours was set in the container, there should be some coarse gravel in the bottom, & a hole(s) in the bottom for drainage. Nice healthy looking cactus!


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Looks like a healthy cactus! perhaps mammilaria pilcayensis: that's something they may naturally do when getting around 22-30cm in height; in nature they may grow in clusters, and this helps them expand outward a little. The side its leaning toward likely has become a little weaker than the other side. As long as it looks ok it likely is: closeups might ...


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Looks like a barrel or maybe fishhook cactus; according to this https://wryheat.wordpress.com/2009/08/01/edible-desert-plants-barrel-cactus-fruit/#:~:text=Most%20cacti%20bloom%20in%20the,prickly%20pear%2C%20and%20barrel%20cactus., all cactus fruits are edible, but not all are palatable. The fruits on this one still look a little green, but you can try one ...


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