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What deficiency is this?

Backstabbathstarted grow question 4 years ago

Can someone tell me what this is being caused by? My suspicion is a potassium/ calcium deficiency? It's affecting mostly the larger fan leaves. Also, affected leaf stems are turning purple. Posted a pic of one of the leaves

Backstabbath

Backstabbath

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Leaves. Color - Dark-brown

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GMSgrowsanswered grow question 4 years ago

Could be a potassium deficiency. Check your runoff waters ph and ec levels to know for sure. Ph out, lockout, ec to high lockout. Ph and ec both ok for flower time , then you have a deficiency.

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Hempy_The_Kidanswered grow question 4 years ago

I agree with gmslave as well. Potassium deficiency due to PH fluctuations.

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MrStinkyanswered grow question 4 years ago

Yep, I think potassium too! @gmslave

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