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Moon Cactus

Q.Brown spot on the head of my moon cactus

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

My red moon cactus is getting a dark brown spot on it’s head. What should.i do? It is next to three other ones that look ok. Let me know if I should remove the red to protect the other cacti and succulents in terrainum.