leaves curling under

I have a 17 day old Bubba Kush seedling that is doing this. Only thing is it's the only plant doing it out of 18. The temps 84 in my closet so it might be heat. Any suggestions?

I have found that leaves can curl if you have problem with fungus gnats. the larvae feed on your roots.

It seems I'm starting to have this issue too. Yesterday, it was only one leaf curled under but today there's a couple more curling under and it all started after I changed my reservoir water. All my plants share the same water/nutes but only one plant is exhibiting this behavior, so if it was nute related you'd think all my plants would have curling leaves… right? Not to mention the one plant that is having issues is the biggest/tallest by a long shot (you'd think the biggest/tallest would be able to handle the most nutes of any). My room fluctuates between 66-80F so it's probably not temp related, although since it is the tallest plant, it does sit pretty close to the light but my hand passes the "burn" test (it doesn't feel hot). Water PH is about 6.0. Highpsi mentioned that increasing the nute strength too quickly could cause it too, and that is definitely a possibility (The res was filled with water + nutes 3 weeks ago and I did not add any additional nutes when I occasionally had to refill the res). The watering schedule is shared amongst all my plants and has been the same since day one (one min on, 5 mins off - aeroponic system) so it's probably not over/under watering. I've never heard of EC nor do I have a ppm meter so I can't give numbers on those. My ladies are on their 4th week of flowering btw.

What do you guys think about this? Will my plant still produce big buds with curled leaves?

When u force a Cannabis plant to reveg (specially for short periods of time) one of the major drawbacks is the possibility of getting leaf curling without particular signs of leaf descoloration (the other is the increase of hermie plants), this phenomenon happens because the plant produces 2 dif tipes of leaf tissue in a very short period of time causing the leafs to curl or even to wry...its also stated that Haze or Haze dominant plants have an easier recovery due to their higher growth rate while Indica or Indica dominant plants due to their more compact and stacky structure and tend to take longer to recover...also the plants imunnitary system is seriously damaged in plants that are reveg, this may lead to poor yield, poor taste and low pest and plague resistance.......it would be nice to ear what more experienced growers have to say on this

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i have alot of success by taking clones of my plants and then just flowering those as soon as roots develop, small yield for the clone but gives you idea of the sex.

looks like over fert, some strains are really freakin sensitive to high EC/ppm. i'd try flushing and going with a lower nute dose

omg same problem ..top of plant is dark green and curling under. and the bottom is fine.i think its a combination of too much nutes and too much ,light/heat stress..im gonna try flushing.and tying it farther from the light

Did the flush and light spacing help you sort this issue out as i am starting to show the same signs but not as bad yet?

You have your nutes too hot. Once the leaves curl under they won't come back, watch the new growth.

Too much heat causes the leaves to curl up on the edges, like you do with your tongue.

Flush with plain water and start with about half the nutes you are currently using.

I can add to the reveg topic. I had a cindy 99 try to flower on me....she has since been revegging. I got the leaf curl as well. I know for a fact I am not over feeding...although I cant say for sure if nutrients are building up in root zone. I have two other plants in the same soil same setup that are doing fine. The differences are strain and the other is trying to reveg. Ive fed once and its been many weeks. Heat could also be a problem with this...i am around 83F.

Revegging plants seem to do much better going indoor flower to outdoor veg rather than indoor flower to indoor veg.

I know outdoor growers can experience a slight re-veg under strong full moon light.... And that can lead to some under-curl.... Just something I've noticed through the years....