Help, leaves

[simisimis]

I am pretty sure this has been answered already but I do not know how to describe the leaves behaviour so I could google for that.. Its bending, for sure, but how which part and which direction... probably photos would make more sense and somebody could answer this within 30sec..

Super lemon haze:


This plant is 2 weeks into flower and all of the bottom leaves are perfectly fine, very wide and strong and green, only the very top ones have middle blade or few blades in a leaf bended. It's LST'ed, I am was watering it till today with vegging biogrow nutes plus root stimulator, today I am going to switch to flowering nutes since the monstrous grow a bit calmed down and plant is more into pistil production.
Any suggestions?
Please let me kniow if there's any additional info I could provide..
Cheers!

 

[KLWJ]

Hard one man, I used to get this when it was hot and dry (air) the curling. But the weird blade angles make me think root damage. Certainly a difficult one.

 

[KLWJ]

Scratch the root damage bro, humidity, heat or stress (unlikely, they look otherwise great).

 

[simisimis]

Hard one man, I used to get this when it was hot and dry (air) the curling. But the weird blade angles make me think root damage. Certainly a difficult one.

well hot and dry actually can make sense.. cause my humidity is about 36% at lower part of plant, since 150W hps is heating at around 8"(20cm) from tops and only outtake fan is spinning at the moment, temps on top part sometimes rise to 95F(35C)... But the thing is that I have another plant C99 and that one love it, they both share the same light and C99 does not show any heat stress..
lower part of plants are at a temperature around 68-77F(20-25C)..

 

[simisimis]

and btw, I really doubt about root dmg, cause I did not touch growing pot for weeks, bucket is covered with plastic so roots would not be exposed to light..

 

[dimebong]

They're overfed. That is Nitrogen toxicity.

 

[KLWJ]

They're overfed. That is Nitrogen toxicity.

I considered that but the leaf tips are white, never had them go white with overfert especially nitrogen.

 

[simisimis]

They're overfed. That is Nitrogen toxicity.

Yes that could also be true, I was watering both plants with the same water + nutes, but C99 is 2 weeks older and therefore like 2-3 times bigger, so one could consume all of the feeding I provide, while other can choke on it.. I will try to ease on nitrogen, thank you!

 

[simisimis]

I considered that but the leaf tips are white, never had them go white with overfert especially nitrogen.

Maybe you got wrong impression from pics, leaf tips are not white, all leaves are perfectly green

 

[KLWJ]

well hot and dry actually can make sense.. cause my humidity is about 36% at lower part of plant, since 150W hps is heating at around 8"(20cm) from tops and only outtake fan is spinning at the moment, temps on top part sometimes rise to 95F(35C)... But the thing is that I have another plant C99 and that one love it, they both share the same light and C99 does not show any heat stress..
lower part of plants are at a temperature around 68-77F(20-25C)..

Yeh bro, I rethought my comment after I put it in haha. 8" should be all good but still put the top side of your hand there and see if its comfortable, I've had it closer with a 400w but its a gamble haha. If the other plant is a different strain it may like the heat more or if its the same it may have a bigger root system to keep up with the transpiration. Still 35 on the tops sounds hot but do the hand test. Honestly they look so damn healthy otherwise, it's a hard one.

Make sure some light is going through, trim off some large leaves to allow light through the canopy, not too many though. My mums do what the photos show when the canopy gets too thick, can't tell if its light or not enough heat.

 

[dimebong]

I considered that but the leaf tips are white, never had them go white with overfert especially nitrogen.

A massive overfeeding can have the leaves canoeing within 24 hours with no tip burn at all
where as continuous mild overfeeding over time can produce tip burn and no canoeing.
Regardless, N toxicity is pretty easy to spot and is a pretty common occurrence
with the instructions some people put on their ferts.

Dark leaves with dry/papery surfaces, canoeing, hooking, leaves tearing ect...

 

[Zoltan44x]

^^ Right.
Excess N also delays flowering and could be why there are no pistils.
Maybe you should also check what is VPD (Vapour Pressure defict).
%36 Humidty with 35 C is another problem imo.

 

[KLWJ]

^^ Right.
Excess N also delays flowering and could be why there are no pistils.
Maybe you should also check what is VPD (Vapour Pressure defict).
%36 Humidty with 35 C is another problem imo.

Haha you learn new things every day, been doing this for 5 years and had never heard of VPD, will not be sleeping tonight... Research to be done.

 

[simisimis]

well thanks a million for replies, really great info, it must be nitrogen then, cause plant is dark green, papery surface, canoeing and pistils only few days ago appeared on main stem, whereas on c99 all sidebranches are already covered with pistils.. temperature feels really ok for the hand, in the grow area its 20-26 degrees just very top is hotter, but im waiting for pc fan delivery so I could add some intake air and cool it down, for now i was seeing this like in nature, the top is heated way more by the sun than lower branches.. i thought 36% humidity is a good thing during flowering so i did nothing about it. i will have my attention on vpd as well since i never heard about it as well, thanks guys, great help!

 

[simisimis]

Guys.. um maybe I am worrying too much or want things to happen too fast, but maybe not..

Here's what I did, yesterday before turning the lights off, I watered this plant with plain water, I adjusted pH a bit above like 7 or 7.2 so the roots would absorb less from soil and did not add any ferts. Also I added a bowl with a wet towel dipped in it and humidity raised to 48%, probably by tonight it will be something around 55%. After watering lights went straight off, this morning I woke up and after 10min the light went on, so mainly plant was in 12hours of darkness and had like 10min of light between my observations, anyway, some of those canoeing blades suddenly bended upwards.. So I was wondering is this some other type of deficiency or it getting better or I should wait at least until tonight so it would be more clear?
Here are some pics:

By the way the very top seems way better than yesterday, so maybe it is getting better after all.

 

[Kite High]

well thanks a million for replies, really great info, it must be nitrogen then, cause plant is dark green, papery surface, canoeing and pistils only few days ago appeared on main stem, whereas on c99 all sidebranches are already covered with pistils.. temperature feels really ok for the hand, in the grow area its 20-26 degrees just very top is hotter, but im waiting for pc fan delivery so I could add some intake air and cool it down, for now i was seeing this like in nature, the top is heated way more by the sun than lower branches.. i thought 36% humidity is a good thing during flowering so i did nothing about it. i will have my attention on vpd as well since i never heard about it as well, thanks guys, great help!

I maintain 30% rh throughout the grow....IME improves potency and eliminates fungus problems...hasn't effected yield

 

[simisimis]

I maintain 30% rh throughout the grow....IME improves potency and eliminates fungus problems...hasn't effected yield

I had the same feeling actually, those plants were ok without any humidity boost through all of the veg and also felt more safe about not having any mold in there.. And I also harvested quite a nice plant on my previous grow without adding any humidity to it.. So I might get back to ~36-40%.
Thanks for comment

I would also be very happy if someone could comment about leaves bending from canoe form bended downwards to canoe form bended upwards in one night, what kind of process is happening in there