Can anyone tell me what is causing this leaf curl

Tmurrayftw

Active Member
It could just be a genetic defect in that particular plant, unless they are all clones. Some are more/less sensitive to heat, nutrients, moisture, etc than others. Even amongst the same strain, you can have variations from seed to seed that could account for this.

Your light itself or the angle it hangs at could also be causing hotspots that HAPPEN to be mostly over that one plant.

Go grab an infrared thermometer from the hardware store for like 20$, and take a leaf surface temp reading if you want to be sure.
I'll order one on Amazon our hardware stores dont have shit lol would one of those laser thermometers work i believe i have one
 

Tmurrayftw

Active Member
It could just be a genetic defect in that particular plant, unless they are all clones. Some are more/less sensitive to heat, nutrients, moisture, etc than others. Even amongst the same strain, you can have variations from seed to seed that could account for this.

Your light itself or the angle it hangs at could also be causing hotspots that HAPPEN to be mostly over that one plant.

Go grab an infrared thermometer from the hardware store for like 20$, and take a leaf surface temp reading if you want to be sure.
The light I have em under is extremely powerful it pull 450 w from the wall but i thought I had it hanging high enought ive only ever used smaller 150 watt leds in the past maybe its only burning that plant
 

BluntMoniker

Well-Known Member
Well my heat and humidity are perfect thats why it makes no sense to me and have been giving the exact same nute as my other plants im dumbfounded lol
The leaves are telling you otherwise :p

Look at the picture you posted. ONLY the top leaves are thin and tacoing. The ones just below it are wide and perfectly fine... likely because they are further from the heat source. And im sure you'll notice that same trend if you look at the plant itself... the leaves at the bottom are fine, leaves up top are much thinner, and the ones at the very top are the ones tacoing.

I'll order one on Amazon our hardware stores dont have shit lol would one of those laser thermometers work i believe i have one
Yes.. the "laser" thermometers are optimal for getting surface temperatures. But even if you don't have one, just move your lights up some and see what happens. If your at 18in now, id go up another 6in, give it a week and see what happens. If the leaves aren't brown/crispy they'll flatten out. If they're cruspy, they'll likely stay tacoed regardless.


Do me a favor though. Go to the app store and download the "Lux Light Meter" app, then tell me what your lux readings are at canopy height. The smart phone lux meters aren't super accurate, but should help give us an idea of where your at. I had someone test it against an actual lux meter and it was only a few thousand off, so while it isn't perfect, its a convenient way of seeing light intensity at different heights/areas
 

Tmurrayftw

Active Member
The leaves are telling you otherwise :p

Look at the picture you posted. ONLY the top leaves are thin and tacoing. The ones just below it are wide and perfectly fine... likely because they are further from the heat source. And im sure you'll notice that same trend if you look at the plant itself... the leaves at the bottom are fine, leaves up top are much thinner, and the ones at the very top are the ones tacoing.



Yes.. the "laser" thermometers are optimal for getting surface temperatures. But even if you don't have one, just move your lights up some and see what happens. If your at 18in now, id go up another 6in, give it a week and see what happens. If the leaves aren't brown/crispy they'll flatten out. If they're cruspy, they'll likely stay tacoed regardless.


Do me a favor though. Go to the app store and download the "Lux Light Meter" app, then tell me what your lux readings are at canopy height. The smart phone lux meters aren't super accurate, but should help give us an idea of where your at. I had someone test it against an actual lux meter and it was only a few thousand off, so while it isn't perfect, its a convenient way of seeing light intensity at different heights/areas
Its funny you say that I've already used it and it was around 30k
 

BluntMoniker

Well-Known Member
No i think that was before I moved them up it was somewhere around 20k
Damn.. then maybe we are wrong! Cus mine are at like 80-90k at the leaf surface but I dont have those issues at all. Hate to say that to ya, but id rather do what I can to help you fix your plant, than pretend I'm right if everything points to the opposite.

With that said though, there's nothing else I can think of that would cause this. And even looking around Google, growweedeasy, and other forums, heat stress is the only answer anyone else gives either, so im really stumped if thats genuinely not the issue
 

Aussieaceae

Well-Known Member
Overwatering + overfert, can look exactly the same as heat stress. Especially in combination with poor aeration, poor drainage, low ph and root disease.
Both heat / low humidity problems can look exactly the same, because the leaves are dry and crisp either way. Plus overwatering and overfert will only make it worse.

I'm not good at spotting pests. I do think you should look for mites really thoroughly. Especially in all the canoe shaped leaves.
 

Tmurrayftw

Active Member
Damn.. then maybe we are wrong! Cus mine are at like 80-90k at the leaf surface but I dont have those issues at all. Hate to say that to ya, but id rather do what I can to help you fix your plant, than pretend I'm right if everything points to the opposite.

With that said though, there's nothing else I can think of that would cause this. And even looking around Google, growweedeasy, and other forums, heat stress is the only answer anyone else gives either, so im really stumped if thats genuinely not the issue
Well maybe it is just a genetic defect in that particular plant because all the others in the twnt look beautiful
 

Raspberrykiwi

Well-Known Member
people have said over fert but what about a calcium

Thats what I was thinking im using humboldt secret and its been really good i don't feel like it has anything to do with whats going on with my plants
Your tips are curling up and burning off. You can see it without the lights off. Like I said, hard to tel with the blurple. But it’s most likely a toxicity and possibly light intensity. I’d say back off the nutes, flush if needed and raise your light.
 

Tmurrayftw

Active Member
Your tips are curling up and burning off. You can see it without the lights off. Like I said, hard to tel with the blurple. But it’s most likely a toxicity and possibly light intensity. I’d say back off the nutes, flush if needed and raise your light.
It started doing it really bad after I over watered the other day they drooped down really bad came back up and started curling I had like 30% runoff I was worried I was going heavy on the nutes and my ppm was less than 1k which I found odd because its usually super high from the first runoff
 

Rogerm562

Member
people have said over fert but what about a calcium

Thats what I was thinking im using humboldt secret and its been really good i don't feel like it has anything to do with whats going on with my plants
I mean it could be a number of things. But my guess would be some type of deficiency. All most looks like possibly too much N. If you’re using anything with nitrogen higher than 2 through flower that’s probably your problem. Nitrogen is actually Initially toxic for plants in the flower stage.
 

Rogerm562

Member
Looking at your most recent pics I can tell you you need to back off the N and increase P & K. The dark green shiny leaves is an indicator of too much nitrogen.
 
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