What is this on the leaves

OutdoorUKstarted grow question 4y ago

What is this on the leaves growing in coco and feeding at 1 ec with a little run off

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Leaves. Color - Dark-brown

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Robertsanswered grow question 4y ago

Hard to say without a picture. Coco requires cal mag as a additive. Best guess without seeing it. Or your ph is not right in coco. Coco requires heavy irrigation regularly and ph monitoring constantly if going in and out water.

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