Last year, my boyfriend bought this huge cactus for my birthday. As I live in Western Europe, I've put it in the spot in my house that has the most light and where it's always warm. I don't water it a lot, and it's always been doing pretty good, but the other day when I turned it (I do that sometimes to avoid having always the light coming on the same side), I noticed there were huge black 'stains' on the extremities, and that the base was full of white mold/fungus/?
See pictures I've attached.
I have no idea what it is but it seems to have spread enough to threaten my cactus' well-being and since I noticed it for the first time a few days ago, it seems to have visibly spread even more.
Does anyone know what I can do? Is there anything to do at all? I would be very sad to give up on it, it's so big and it was such a nice gift...
Thank you very much for your help!
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