Leaf edges curling up

What does this look like? Heat stress? Nutrient deficiency?

hmmm hard to say mine did that and I cut back the nutes. Just for a minute to see the results. I also kept the temp ideal and just documented it. Try to do what you can and journal your results. Some of the others here can probably give you a more concise answer though. good luck. Mine snapped right back into shape after I decreased niutes.

from here it looks healthy.. when my leaves look nice and crisp like that, im a happy man. Lookin good man !

the plant is growing vigorously and i'm not overly concerned about the leaf curl... but, it's my first grow so every little thing makes me go "hmmm..."

yea i know how that can be.. i was so obsessed about being able to tell the female flower from the male flower.. thats all i researched for months. Then one day a male flower poped up.. and i finally Knew what was up..
hehe good times.

yeah nutes. that happened to me.

mine are doing the exact same thing, but out of 12 plants in my ebb and flow tray, only the 4 plants that were closest to the bulb look like that. But mine are only 2 weeks old and on a 15% nute solution. It has to have something to do with the heat or light intensity, because all 12 get the same nutes. I'll get some pics in a min.

thebAse said:

What does this look like? Heat stress? Nutrient deficiency?

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since those leaves curled up before showing signs of burns it is to 85% heat stress causing this, not nutes.

to make sure pass some facts about your grow:
-temps low/high
-lights
-pH of all liquids going in (and maybe even out if hydro)
-relative moister level

additional would be from value
-age
-nutes if you use by now
-grow medium
-if you grow in pots/how those compartments are made
-watering

As promised: The first three pictures are of the curling plants, as I said before, the plants in question were on the "bulb side" of the reflector... receiving.. I would imagine, slightly more heat then the rest of the plants. The 4th pic shows two plants, the right one with curling leaves, and the left one in perfect health..getting the exact same nute solution. The last one is an out of focus shot of the entire tray, just to help judge relative distance..but the light was about 6 inches lower until I moved it an hour ago, in an effort to correct the curling.

panessapanessa said:

As promised: The first three pictures are of the curling plants, as I said before, the plants in question were on the "bulb side" of the reflector... receiving.. I would imagine, slightly more heat then the rest of the plants. The 4th pic shows two plants, the right one with curling leaves, and the left one in perfect health..getting the exacnuteme nute solution. The last one is an out of focus shot of the entire tray, just to help judge relative distance..but the light was about 6 inches lower until I moved it an hour ago, in an effort to correct the curling.

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i see crinkled Mylar at your grows walls, let me guess where a good part of your plants heat stress originates from...

on way to avoid this:
-Mylar only FLAT to the wall
-fan running at all times
-proper ventilation of an enclosed grow area
-proper monitoring of temps and humidity!

the mylar is crinkled, but its because the fans I have going cause it to move constantly...had I thought about it I would have put some kind of plywood and then stuck the mylar to it, but I have to wait till these are done to remodel. As far as that being the source of the heat stress, its possible, but considering the mylar is constantly moving, I can't imagine its refracting light on one part of the plants long enough to burn only those few. temps are in the low 80s but im going to have to work on that when its time to turn the hps on.

mylar is a superb insulator, so it raises temps in grows usually quit a bit, if it got air pockets behind, this is even a bit worth since air it self is an isolator, following me?

add now a few big CFLs and you got some gooood temps there, add a MH 250W or big and you got perfect heat stress.

even with CFLs you got heat stress since you have to keep them so damn close, without a fan running in there it can get quite a shitty situation.

theres plenty of airflow and ventilation, I had to prop one of the weaker ones up with toothpicks because he couldn't take the wind...but the rest are nice and thick at the stems....I took the light up about another 10 inches, and watered them...if there not looking better in the morning I'll investigate further.

panessa said:

theres plenty of airflow and ventilation, I had to prop one of the weaker ones up with toothpicks because he couldn't take the wind...but the rest are nice and thick at the stems....I took the light up about another 10 inches, and watered them...if there not looking better in the morning I'll investigate further.

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what lights are you using there? CFL, floro or MH?
a little one that can't take the full fury of a fan is normally stretched or you got there some high end power fan far to big to grow with

1 400w MH and 2 40w floros. 11/12 are standing straight up and are pretty thick, I don't know about the stretching...hes closer to the light than a few others that dont share his condition...he may just be a runt. And I have the fans pointed more-so at the mylar, in an attempt to create some kind of current in the room rather than blowing on the plants directly.

i dont think mylar can do that, i have used mylar for over 15 years and never seen this symptom until .... i have been doing og kush for 5 years and it is the only plant that does that often. it does resemble heat stress but you should also realise that when leafs curl upward too it has to do with the release of moisture in the leaf. is the fans too high for the plant at such a tender age or is your humidity to low like below 35%
-remember sativas do not like a ton of light, even those strains that are mixed.

don't know cause to me it is just the genetics of og. everything else looks normal..

so i have to say either genetics or elemental problem.

im having the same problem on one of my plants but its an unknown strain growing in the middle of 2 others that are the same height same nutes so im guessing its an og thing

Yo Panessa,
Did moving the light higher help? Did the problem disappear? If so, what did you do? The reason I ask is a few of my vegging babies are doing the same thing. I've tried moving the light, less feeding, less watering (I was watering too often), more airflow, etc, and it's still happening. Am on a 400W Son-Agro in a XL Budbox with in-line fan. Temps regularly at 24-28C, humidity average of 40%. Lamp is about 22" from the nearest plant (which strangely doesn't show any signs of heat-stress).

I have a strain that does this exact thing.Usually just one or two leaves and raisng my lights is the cure for me.I now have a lenght of chain hanging form the reflector 14 inches long so I am never guessing how far away they are from the tops.That has helped tremendously.

having same trouble with plants some leafs are curled my plants are 7weeks old and 19to23inches tall please help