Leaves folding lengthwise along the vein, in on itself

[gkoat]

I know there are alot of variables to include when diagnosing these problems, but I just thought I'd ask if anyone is familiar with this occurring...

Basically the leaves are an extremely healthy green, yet have gone from flat to more of a V shape with the trich development. I've heard of trichs sticking to eachother along the vein, but the outer edges of the leaves seem to curl towards one another - as if the individual leaf was trying to clap its upper halves together.

Indica, approaching 60 days of flowering, completely organic, soil+coco mix.

 

[-ShutterBug-]

Pictures would help but no matter.
*edit*For some reason I was picturing some Deep Chunk. Could of been the half dozen cookies I ate.*

 

[Pig-Pen]

Over watering or over feeding would be my guess....

 

[TGT]

Are you doing a vertical grow, or is your light coming from the sides and not just from the top?

TGT

 

[rootfingers]

I have had this problem as well, almost every grow really. It seems to get better with each grow though and I can think of a couple reasons why it might occur.

One would be too much light or heat. For me this always happened in places where the light was brightest on my plants.

Two would be an imbalanced nutrient profile. Since I have gotten my nutrients more dialed in the plants seem to do this less and less. I couldn't say exactly what type of overfeeding or deficiency it is but getting your nutrient mixes dialed might help.

 

[DIGITALHIPPY]

sounds like heat stress...pics needed.

 

[smokeymacpot]

some do it from heat, some from heat+lack of water or they do it anyway and its normal for that strain.

upload pics if your worried!

 

[gkoat]

Thanks for the responses guys....a bit more info:

I can definitely see the heat having something to do with it, but there is NO lack of water. In fact, it could be overwatering as these things are very demanding in the coco mix compared to soil, but no other leaves are showing similar signs.

Here's the interesting factor that makes me think it's heat...it's only happening on one cola, and this cola somehow or another escaped the perfectly even canopy of others we had, so it's significantly closer to the light, but even then, the curling does not appear to be a *bad* thing, which makes me think it's somewhat genetic...

But rootfingers you said something that really interests me - TOO much light? I will say, this particular pocket of light space, whatever plant is there, noticably produces more significant growth during veg and now that it's stretched from flowering, it's probably even closer to this light pocket.(We were scared to order a better reflector online originally, bad call on our part).

I'll go ahead and chalk it up to heat thus far, but tell me more about this too much light concept...I'll try to get you guys a pic tonight when the light comes on, but it will be cell phone as I don't have a camera. Will do my best.

 

[giroldo]

i was told it was from ph curling. I could be wrong though??

 

[rootfingers]

Well, I use pl systems hps 1k lights (hortilux) in silverstar reflectors. The hps bulbs shape (long) causes a strip of better lighting or "hot spot" that runs the length of the canopy paralel to the bulb. I notice this because the buds down this center row are usually bigger and they go yellow faster than the buds on the outsides of the canopy. Some even show signs of light bleaching, in that the peak of the flower's growth tip washes out and leaves a white/pale yellow tip instead of the green or purple of the outside ones.

There isn't really anything I can do about this but to move plants around if its early enough in flower or tie them down in places if it is later on in flower. It seems to me that this is something that people using HID's just have to learn to deal with either by getting more of a smaller light (ie. two 600 watters instead of a 1k), using light movers, or just move and shape your canopy as best you can like I do. Also, I suppose you could move your light further from the tops of your plants but I always like to get my lights right in there and get as many lumens to my girls as possible.

As far as the leaf curl goes, this time around I got it mainly down the parallel to my bulb "hot strip" of my light and this lead me to two possible conclusions. One, either my light is overheating this area and the curl is caused by excess heat or light. Or two, the plants that are getting more light down that hot strip are wanting to use more light because it is available to them and since I am feeding for the entire canopy do not have an adequate nutrient profile to produce the way they want to.

I am taking down this particular batch of plants in a week so I will post some pictures here to illustrate what I am talking about.
. . .wonderfuck, should be pretty!

peace, rf

 

[smokeymacpot]

you can just tie the affected cola so its just a little further away from the light.

 

[greenisgold]

I think this leaf effect is caused by a few things: heat, nutes, salts, additives, ph... you name it. Why because right now i'm growing 20 clones in 1 gal bags, same strain, same soil, same everything. But I mix my soil and I think certain bags get a little more of this or that. My light is on a mover and I move the plants ever 4 days or so. But there are only 4 plants that show this problem no metter where they are put.So I think it's a few things that cause this, not just heat.

 

[clorox]

under watering or not enough light

 

[surferdog]

curling leaf

curling leaf

I have this curling leaf problem , I stretch the plants outside with lights that go on at dark and off at light , when big enough they are moved to a finish pit,all my plants get the same everything ( light , nutrients,etc.) I put what appeared to be a healthy plant out to finish , I always do this step in late afternoon ( not to hot , all nigh to recuperate ) The next morning 1/3 of the plants top leave were curled closed and all the leaves two or three branches below were twisted and looking dry I have never had this happen before and I am at a loss for why it is happening . Any insight would be appreciated.

 

[Sunfire]

Ok...this is just my experiences.

There's two types of curl, one that does a V, I call taco curl. The other rolls up like a O and I call that burrito curl.

The taco curl is over transpiration which is mainly caused by heat and or drought, low humidity and wind. This pretty much means the plant can't keep up with the water demand. Many factors can cause this as I previously stated, bad pH and lock up or deficiencies can cause it too.

I've only seen the burrito curl with three things.
1. This happens on super frosty little leaves late in flower and is natural, Chem dog does it a lot.
2. Hemp russet and broad mites.
3. High humidity and cold temps. I see this a lot in winter time, mostly on lower leaves, I used to trip out on this but have learned to not.

 

[WoodShedGrower]

Lengthwise folding here too

Lengthwise folding here too

Bucket grow in a small outdoor woodshed.

'Night' temps were super low until recent intake hot-box addition, now they are up to 50f (in the bucket) explains why a 59day old looks like a 2wk old. Humidity low! Down to 11% and can't seem to get over 40% for long. Heat stress maybe? There's 140 true watts of CFL 1-3" away getting mid 70s in the 'Day'. She's in Great soil, drains well, 6.5PH runoff, had little if any nutes, 'mostly rain water @~ 6.8PH and a few weak (650ppm) feeds of Fish fert + calmag + orchid feed + Epsom salts + molasses each 3rd or 4th feed.
Am also wondering if the purple on the 'teeth' is cold related or a sign of a problem.
For all the research I believe it's either:- Heat, cold, low humidity, P deficiency.. Any other thoughts/solutions out there?