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What could it be? Nutrient deficiency?

Schnahacken
Schnahackenstarted grow question 5 months ago
What could it be? Nutrient deficiency?
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Leaves. Color - Dark-purple
Feeding. Deficiences
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Hologram
Hologramanswered grow question 5 months ago
Thats just a lil bit of rust rust-colored spots on marijuana leaves indicate a fungal infection or a deficiency in magnesium or calcium. Nutrient burn is also a possible culprit. i dont think its a fungus, those you can rub off.. mayb its a lock out, she had enough for now i think. flush her with just water so it wont get worse good luck
Lerome
Leromeanswered grow question 5 months ago
Your mandarin plant is highly deficient in potassium btw (leaves yellowing from the outside with brown spots)
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Lerome
Leromeanswered grow question 5 months ago
CalMag deficiency and slight deficiency in flowering nutrients. (potassium and phosphorus)
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Organoman
Organomananswered grow question 5 months ago
Calcium deficiency. Definitely not "rust" or due to cool night temps. Absolutely no need to "flush".........add a cal/mag supplement to your line up, or increase the dosage if already using a cal/mag supplement.
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LetsGrowSome
LetsGrowSomeanswered grow question 5 months ago
Could be phosphorus deficient, or could just be from cooler night time temps. I've found below 70F that purple leaves can occur and it's ok/normal. Mine do this when the temp drops below 68F at night. Hasn't effected my outcome to this point on my grows and looks cool to me, so I don't worry about it. Just my thoughts. Best of Luck! Happy Growing!
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