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Beginner Gardening: cacti turning red at the top and tips, 1 by aeberardi

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Subject: cacti turning red at the top and tips

Forum: Beginner Gardening

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Photo of cacti turning red at the top and tips
aeberardi wrote:
Hi there - over the past three months my cacti have started to lose their green get red at the tops and tips. I water them lightly every two weeks, and they are at a window facing northwest - they get full afternoon sun.

Are they sunburned? Underwatered/overwatered? In need of fertilizer? Or is this normal?

If anyone has any advice, I would appreciate it!