Leaves curling inwards and deformed looking also wmweird sharp edges

I don’t know wht this is but I know I have no pests at all and all the others are fine but one but I have sorted that one now I just can’t seem to find the reason for this not wind burn. Not PH. Not over watering. I have no idea what’s wrong with it

What strain is that? What are you feeding, at what ppm/ec? What is the light and distance? Temps, RH? I've seen strains with deep serrations on the leaves. That alone is not concerning, but leaf curling and folding up indicates some type of stressor.

Temps/ humidity? Serrated edges will curl when plant is having a hard time getting water vapor out. Because it’s too hot, has been over-watered or there is already too much moisture in the air.

Heat stress or salt stress if you're watering correctly. Check PPM

That's not weed, it looks like a triffid. Better watch out!

Nah nah it’s the only one that’s doing it I feed it the same water as the others and it’s in the same room and there all fine so it can’t be that but what is ppm???

Jake6632 said:

Nah nah it’s the only one that’s doing it I feed it the same water as the others and it’s in the same room and there all fine so it can’t be that but what is ppm???

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Ppm is parts per million of Total Dissolved Solids (TDS). In cheap ppm meters, the value is derived from the Electrical Conductivity (EC) of the solution. A true lab test uses other measures to get the conductive and non-conductive elements of the solution. Synthetic nutrients are salts, like Calcium Nitrate. When they go in the water mix, they break into their ions which imparts higher electrical conductivity to the solution. PPM or EC gives you a good measure of

1) how much stuff is in your tap water

2) how strong is your nutrient/water mix