leaves curling during flowering??

what is or could be the problem?? need help

This is a classic case of nitrogen toxicity.

so what do i do??

I have a Super Lemon Haze plant that does that exact same thing in 4th week of flower. What strain?

yea mines in 3rd week,but its blue dream

I have read that the curling leaves (the claw) is a pheno thing? I maintain 6.3 ish pH, im using FF nutes at half strength, watering every 3 days ...and it still does it. Sooooo...IDFK what the issue is either man. Maybe a veteran will chime in...

wow. looks almost like mine but mine not as bad , jus give em water once , then cut back on amino acids aka nitrogen, should be ok jus make sure you dont add more

my $ says you use ocean forest which is hot , high in nitro ,

Hey Sir Smoke - cheers for pics - that is absolutely identical to what i had a Northern Lights do to me about 2 weeks into flower. I think original answer is right; from what i can establish it is too much nitrogen & that then causes lock-out of other nutes (especially magnesium i found).

I was doing a short veg time (seed in soil - seedling - switch to 12/12, all within 3 weeks) and i use Bio-Bizz All-Mix, which is not overly hot but does contain enough nutes for about 4 or 5 weeks of growth normally. From bactracking, i worked out my Nitrogen excess had resulted from me not watering new soil thoroughly enough during the seedling to main pot transplant (i didnt have enough filtered water waiting to use as much as i normally would) and then 1 week after switching to 12/12 i added a small-ish dose of Grow nutes. (i would normally do this on a 5 week veg cycle as it gives them last dash of N before Bloom nutes start - God only knows why i thought it'd still be a good idea on a 2 week veg cycle! doh!). So overall i ended up with more N in the soil than i'd allowed time for the plant to use up - too much N then fucked the soil ph & locked the rest of nutes out & i had a fight to save it!.

But there is a way to save it - firstly give it a big plain water flush asap. Maybe even do another flush about a week later. This will help cool down the soil by flushing alot of N out. Secondly, in the meantime the plant will suffer from other nutes being locked out/flushed away by u, so i found switching to foliar feeding helped alot, although u need to be careful spraying around buds. But if u can take the time to soak shade & sugar leaves in feed water, it will help alot. Mine came out cool in the end!

And finally, in case u not sure what should happen when it's fixed, i found that the old growth/leaves that had already clawed up & thinned themselves didnt really recover back to full, healthy leaves (tho they didnt die too much either) but the signs of recovery show in any new growth should come out looking normal again.

Good luck anyway man!

And also, if it is N deficiency, i would hazard a guess that any new growth at top of your main stems is also coming out a bright, lime green colour?? If so, then is pretty definitely an N def, as the leaves only come out this bright green colour when ironically they can't enuff N! (cause too much N in soil has fucked ph & locked everything out!)

As i said, flush it very thoroughly & it should recover.

And with regards to the pheno thing, to clarify; its more a case that certain varieties certainly will be genetically pre-disposed to tolerating imperfect conditions abit better than a variety with a relatively weaker genetic profile, but at the end of the day if the conditions become too imperfect then its genes don't matter shit, any plant will start to die!

I have a problem with a RKS 2 weeks into flower that looks identical. What are you guys seeing that makes you think too much N? I don't want to over react

alrite well i was thinking about switching my nutes to BLOOM humboldt nutrients. do you think that would help?

oh and i was going to cut off a lot of the big fan leaves too.

I have one plant that does this...if anything goes awry it's leaves will curl. I have never had one that didn't end with curly leaves, and only a few that started flower with straight leaves, but the smoke is Great and the yield is as good as to be expected of a mostly sativa strain that hates any nitrogen at all...and you can't just veg and veg and veg it either...I figured that since I had burnt the very first plant from seed 3 years ago when I started this strain that every clone I had taken had come from an overfertilized plant...so after 4 months it turned yellow at the bottom and I gave it a little fertilizer...and the leaves were straight and felt like leaves for the first time in years...then at 6 months I stupidly thought this thing has doubled in size and it has been 2 months so, what the hey? they can use a little...and I'll be double damned if she didn't curl up on me again! Just like old times old friend....just like old times...so, no matter how little nitrogen you may be giving it is too much for that plant...and the best thing you can do is just not use nutes for at least one whole watering cycle...like let the plant go mostly dry but not totally like limp...and then water it with just water...and then on the next cycle see how it looks and keep going from there...but once nute burnt in flower it is all messed up...since growth kinda slows down the plants use so so so much less...anyway any carb boosters you have just lying about...now is the time to give them a shot, because if you get to the point where there is more carbon than nitrogen then the nitrogen will not be available to the plants...but you can't use a huge amount of the carb booster additives since they also almost always have trace minerals which will then lockout other things...that is where the regular table sugar comes in..but wait for a water cycle to go through...like dry pot- water with no nutes--dry pot again---now what? Carb booster and water--dry pot---no improvement--carb booster and sugar water---dry pot-- issue not fixed-- keep giving sugar water and carb boosters at regular amounts...5 tablespoons sugar/gal and whatever the recommended dose of booster is or just under depending on what you know about how the line works for your plant..anyway give that a shot if you want...I have done it...I have also done nothing and just stopped giving nutes, and eventually it gets better faster with the sugar....

it is definitely overfert...I knoe because I see it all the godbless-ed time!

Same problem with curling leaves during flower, I tried minute doses of aluminum sulfate work very well!!

Leaves curling during flower here too probably from nitrogen toxicity, try a minute amount of aluminum sulfate, seems to work immediately for soil ph reduction!!