Joe Fresh said:

to be clear...the leaves that are burning from the tips and curling upwards, are a potassium deficiency...maybe coupled with a phosphorous deficiency...the leaves cupping from the tips inwards at the top is a water relocation issue(transpiration)..i can tell the leaves at the tops are dark green and shiney, but the leaves under are just curling with interveinal burning and curling upwards.....im almost 99% sure that plant is overfed and in lockout


https://www.icmag.com/ic/showthread.php?t=231387

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Joe Fresh said:

check the runoff from that pot compared to the other ones...i would presume that that plant has either high tds or a low ph in the runoff......just test runoff from one healthy plant and then this one...

sometimes when plants are all in the same room, and one plant has a less developed root system, but you feed them all the same, it can sho these signs on only select plants while the rest are ok...

when seeing an issue with a plant, first thing you should always do is test runoff, 90% of the answers to your questions will lye in the runoff

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