Cactus
Q.

Brown spot on red cactus

Zone 60156 | Anonymous added on July 4, 2018 | Answered

My red cactus has gotten a brown spot on it's head. What causes this? It is right next to three other moon cacti, yellow,orange and pink. Should I remove the red one so it does not contaminate the other cacti or succulents in my terrainium? Thank you

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