Anybody got any ideas on the yellowing on my coryphantha? It’s still firm, and only gets watered when the top tubercles start to wrinkle. Is it sun stress or something more sinister? https://www.allforgardening.com/563335/anybody-got-any-ideas-on-the-yellowing-on-my-coryphantha-its-still-firm-and-only-gets-watered-when-the-top-tubercles-start-to-wrinkle-is-it-sun-stress-or-something-more-sinister/

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