SOIL What is this?

[Electrified]

It looks like heat stress and calcium def but it’s not. I’m baffled! 82 degrees, 1000-1200 co2, 40% humidity, green planet 3 part + b vitamin, water is around 70 degrees when feeding, 800 ppm last feed. Any suggestions?

 

[Tersky]

Could be a root issue. Seems sometimes leaves can curl up like heat stress https://www.growweedeasy.com/cannabis-plant-problems/root-problems-cannabis

 

[HairyFrostyNugs]

One of my plants is doing taco leaves also! Interested in what you find out. Thanks

 

[Canuck147]

Not sure about the curling leaves - some kind of stress on the plant - the yellowing leaves looks like a calcium/magnesium deficiency. I use Green Planet nutes - 3 part system - but I also use their Pro-Cal.

 

[Toker1]

The taco looking leaves on the tops of the plants indicate light /heat/humidity stress. The deficiency on the leaves is most likely due to PH issues.

 

[BlueberryGIrl]

how close are your bulbs to the canopy?

 

[stump]

if it were me I would start by raising my lights up a few inches.

 

[kingfish]

Looks like a PH issue.

 

[Electrified]

I have 1000 watt double ended hps bulbs about 3 feet above the canopy but even at 5 feet the leaves curl the same. I water at 6.2-6.4 every time.

 

[Toker1]

Some stains are more light sensitive than others

 

[NikkiAnne]

This is EXACTLY what happened to my plant a few weeks ago and it turned out to be a pH issue. (too high) It was a couple weeks into my veg stage and i was growing under CFLs about 125w in total. Good luck.

 

[NikkiAnne]

Are you checking pH run off as well? My run off was over a point higher than what I was putting in.