Wrinkled Fan Leaves and New Growth

I have a Kosher Kush and a Violator Kush plant whose new growth started wrinkling along with some fan leaves. They are in coco, with frequent fertigation at around 900 ppm and PH between 5.8 and 6.2. Daytime temp is mid seventies to eighty. RH is mid fifties.

They’re 3 1/2 weeks from seed. The first one is the Kosher:

It was a healthy happy plant a couple of days ago.

The second is the Violator, which also seemed super happy a couple of days ago.

I can’t seem to get my head around what’s going on here. Any help is appreciated.

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Wrinkled leaves usually means some type of root stress or a ph problem or swing. This is usually the first sign you see with root stress.

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How often they going dry? And do you give them any clean phed water inputs. Id say cut back food dont let em dry out all the way but close and litfa. Give em a few days.

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If it weren’t coco I’d think overwatered for sure. I’m letting them dry back a bit now, to see if it helps. They haven’t dried out at all until now. They’re on frequent fertigation on a drip system. Which is supposed to be good practice with coco. They get multiple short waterings a day.

The rest of the plants in the room seem good. But I worry these are the canary in the coal mine.

Once they dry back a bit, I’ll reduce them to 1x daily and see if that changes anything. I’ve also added H2O2 to the reservoirs to clean the root zone.

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I used a good amount of silicate in my last watering and forgot to adjust the ph accordingly, and got the same result. The leave will stay like that but with a proper ph’d flush and the new growth should be back to normal.

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