Cobs and leaf tacoing at the top

[bud-dy]

If nutes, ph, RH and temp are in check what else would cause the leaves on your colas to taco, the tips of the leaves are bending upwards and very very slight tip burn. Lights to close maybe? thinking maybe the cobs are too intense.
I have currently 3 x 3590's(54w each) at 12 inches from my canopy. i raised them to about 16 inches and 12 hours later its still the same, the leaves are still green as well.
plant at 45days flower

 

[Airwalker16]

If nutes, ph, RH and temp are in check what else would cause the leaves on your colas to taco, the tips of the leaves are bending upwards and very very slight tip burn. Lights to close maybe? thinking maybe the cobs are too intense.
I have currently 3 x 3590's(54w each) at 12 inches from my canopy. i raised them to about 16 inches and 12 hours later its still the same, the leaves are still green as well.
plant at 45days flower

Lights just too intense

 

[Viceman666]

If nutes, ph, RH and temp are in check what else would cause the leaves on your colas to taco, the tips of the leaves are bending upwards and very very slight tip burn. Lights to close maybe? thinking maybe the cobs are too intense.
I have currently 3 x 3590's(54w each) at 12 inches from my canopy. i raised them to about 16 inches and 12 hours later its still the same, the leaves are still green as well.
plant at 45days flower

Picture would help but if you left them at 12 inch for the last 40 days i would put it back at 12 inch for the remainder.. it may be on the high side of light for them but they managed to deal with it for so many weeks not sure why you would want to change that at this point..

 

[bud-dy]

If you look at the top left cola you can see the tacoing

 

[Chef420]

Looks like a heat issue. I get that sometimes on mine. Do you have fans blowing across the top of the canopy?

 

[bud-dy]

Yea. But I'm using cobs so heat shouldn't be an issue ? It's about 74-80F in the tent with 50% rh

 

[InTheValley]

mine do this to, but Ive figured out that its a sign of maturation with mine. I run 4 luminus, 300 watts, and had them at the same distance the entire grow, then noticed the taco leaf start when browns hairs started. But its only the leafs that are directly connected to the bud itself, .. Then i also have seen many good utube growers with the same effect towards end of flower, like Alien Riff does it, many OGs do it too, mine is an OG, so im going with, "it happens towards maturation". I have 3 plants, the plant furthest ahead, has major tacoing, the second, that looks a tad behind, is also behind in the taco effect, then the 3rd, that seems to be the least ahead, is just starting to taco. Nutes, temp, PH all the same of each, and under different spectrum of the COBs, I run 2-3500K and 2-4000K,

 

[bud-dy]

mine do this to, but Ive figured out that its a sign of maturation with mine. I run 4 luminus, 300 watts, and had them at the same distance the entire grow, then noticed the taco leaf start when browns hairs started. But its only the leafs that are directly connected to the bud itself, .. Then i also have seen many good utube growers with the same effect towards end of flower, like Alien Riff does it, many OGs do it too, mine is an OG, so im going with, "it happens towards maturation". I have 3 plants, the plant furthest ahead, has major tacoing, the second, that looks a tad behind, is also behind in the taco effect, then the 3rd, that seems to be the least ahead, is just starting to taco. Nutes, temp, PH all the same of each, and under different spectrum of the COBs, I run 2-3500K and 2-4000K,

hmmm, interesting. so it could very well be a strain thing

 

[eyderbuddy]

hmmm, interesting. so it could very well be a strain thing

your temps and humidity are fine... Some strains do this, idk why.

It looks like you're on the edge of nute burn though, that may be related so keep watching.

 

[dandyrandy]

If I believe I have a heat issue due to being too close to my cobs I use an ir thermometer. Cheap but make sure you move it around while pointing it at the colas directly under the cob. It's amazing how hot they get. Then I rotate the bucket to get the cola out of the hot direct light or raise the light. I prefer to rotate the plant.

 

[goofy81]

I've had this happen to me once about 3 grows ago, but it hasn't happened since.
Originally I thought I had too much fans blowing on the leaves causing them to dry out but I guess it wasn't the case.
Just a theory, maybe the leaves are curling because there's so much light it wants to share with the lower growth? Because come to think of it, I started deleafing like mad the grows after.
You can see it on my flowering time lapse on YouTube the leaf serrations curling at around 4th week flower

https://www.google.com.au/url?sa=t&source=web&rct=j&url=https://m.youtube.com/watch?v=NMWhqLNPO0I&ved=2ahUKEwih_ZKIuvveAhVPF4gKHaV1DGIQjjgwAHoECAQQAQ&usg=AOvVaw3CGGUOqtHEx5qT23W_l9oD