My cactus has started to to yellow, it was left in the greenhouse over winter in its normal
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Aye, what a pity. I think it is sunburn. Did it get suddenly very hot and sunny in the greenhouse? – benn Apr 25 '20 at 16:27
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Not that I was aware, I wandered if it was too cold in the greenhouse maybe? – Christopher Woodroffe Apr 26 '20 at 22:03
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If it is caused by cold, it is rot. – benn Apr 26 '20 at 22:07