Cactus question

Fairy castle cactus – I have one that is about 10 years old, big, and it keeps getting black spots on it that I can’t figure out how to get rid of. Any idea what is going on? It seems to have room for growth in the pot, and I not sure based on its size if I could find a bigger pot, much less get it in one.

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1 Comment To "Cactus question"

#1 Comment By Alisma On 03/27/2017 @ 11:30 am

If your cactus appears to have room for growth in its pot, it’s best to keep it there for now. Here is more information on when to repot your cactus:
https://www.gardeningknowhow.com/ornamental/cacti-succulents/scgen/cactus-repotting-info.htm ^[1]

Check whether the black spots feel soft and mushy or sunken. This indicates there might be a rot problem, which can be caused by overwatering. Here is more information:
https://www.gardeningknowhow.com/ornamental/cacti-succulents/scgen/cactus-going-soft.htm ^[2]

Or, it could be a fungal disease, like those seen in the fungi section of this page:
https://cactiguide.com/cactipests/ ^[3]

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URLs in this post:

[1] https://www.gardeningknowhow.com/ornamental/cacti-succulents/scgen/cactus-repotting-info.htm: https://www.gardeningknowhow.com/ornamental/cacti-succulents/scgen/cactus-repotting-info.htm

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

[3] https://cactiguide.com/cactipests/: https://cactiguide.com/cactipests/

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