Enforcer said:

A picture of the whole plant will help also. Were these leaves touching the tent wall or next to the fan?

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Enforcer said:

Ok, I don’t think you have anything to worry about. The rest of the plant looks healthy. Usually when an issue pops up on only one side of the plant or only on a few older leaves on one side, it’s an environmental issue not a nutrient issue. I recommend removing the leaves with the damage, ensuring there is good airflow all around the plant, and monitoring for any further issues. Nice plant

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JSH1973 said:

I would go with the above advice and just remove the dirty looking leaves and keep an eye on it.
It might be from a problem with over/under nutrition that already resolved itself as the plant seems to be healthy looking otherwise.

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LongLiveMamba said:

Growing 4 strains in my grow tent with coco coir, this particular strain is white widow. I’m not sure what is going on with it. Didn’t find much resolve when looking online for what exactly the issue could be. All searches show either phosphorus deficiency, cal-mag issues or fungus... please help!!!

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weed_weasel said:

My thought is that it is a Cal-Mag issue. I had a plant where the leaves were turning like that. I upped the Cal-Mag in my nutrient solution and it stopped. Didn't help leaves already affected but no more appeared. I'm not an expert and could very well be wrong but that's what it seems to me.

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