Leaf serrated edges curling up

[jack96]

Hey y’all

Got an issue with leaf serrated edges curling up
I don’t know if it a light/heat/ VPD issue

Day 17 of 12/12
Growing in coco
Under Gavita 1700s currently set at 50% power
Room temp 78
Leaf temp 77
humidity 60-65%
Co2 1500ppm
Fans blowing over the canopy and not directly on the plants

Ph of mix going in 5.9 run off 5.9

ec of mix going in 2 run off 2.2-2.3

Nutes are
Silica
Calmag
House and garden coco
Liquid karma
Big bud
And beneficials once a week

My ac was broken was waiting on a part for 6 days no ac

Room max temp durring that time was 86 degrees
After few hours of fixing the ac I tried bumping up lights and immediately got leaf curl but in those few hours I had no leaf curl
So I thought it was intensity so I backed off light back to 50% and it’s still showing the same signs

I’m trying to do things one at a time because this leaf curl is an often problem with me that I cannot figure out

Next step is to increase humidity to lower VPD
To maybe slow down the transpiration
Get it around .8-.9 LVPD

My lights are maxed out to the ceilings
About 30-40” away from canopy

I’m usually at 18-24” from canopy by end of stretch which gives me my ideal ppfd

Here are some pics from yesterday
I’ll post some more pics when lights turn on later tonight


Any suggestions is greatly appreciated

 

[Psychobilly]

That could be from heat. The "Canoe look" I mean. Also the RH. If you can, get the temp down a bit, and give them some moisture. Even a small Humidifier from a dollar store would likely help. After re-reading your climate details, it seems you keep the humidity at a good level, but when it hit 86, if the RH dropped too it likely had an impact. Keep the temps as best you can for a few, and add some extra moisture, and see if that fixed them up.

 

[Frimpong]

That could be from heat. The "Canoe look" I mean. Also the RH. If you can, get the temp down a bit, and give them some moisture. Even a small Humidifier from a dollar store would likely help. After re-reading your climate details, it seems you keep the humidity at a good level, but when it hit 86, if the RH dropped too it likely had an impact. Keep the temps as best you can for a few, and add some extra moisture, and see if that fixed them up.

Check your lux .Could be from the light as well 👍

 

[JL2G]

Imho I agree it's likely vpd outta whack. I think your on the right track with the humidifier. I know my plants are much happier when I have the rh up in the 50% - 60% range

 

[HydroRed]

Hey y’all

Got an issue with leaf serrated edges curling up
I don’t know if it a light/heat/ VPD issue

Day 17 of 12/12
Growing in coco
Under Gavita 1700s currently set at 50% power
Room temp 78
Leaf temp 77
humidity 60-65%
Co2 1500ppm
Fans blowing over the canopy and not directly on the plants

Ph of mix going in 5.9 run off 5.9

ec of mix going in 2 run off 2.2-2.3

Nutes are
Silica
Calmag
House and garden coco
Liquid karma
Big bud
And beneficials once a week

My ac was broken was waiting on a part for 6 days no ac

Room max temp durring that time was 86 degrees
After few hours of fixing the ac I tried bumping up lights and immediately got leaf curl but in those few hours I had no leaf curl
So I thought it was intensity so I backed off light back to 50% and it’s still showing the same signs

I’m trying to do things one at a time because this leaf curl is an often problem with me that I cannot figure out

Next step is to increase humidity to lower VPD
To maybe slow down the transpiration
Get it around .8-.9 LVPD

My lights are maxed out to the ceilings
About 30-40” away from canopy

I’m usually at 18-24” from canopy by end of stretch which gives me my ideal ppfd

Here are some pics from yesterday
I’ll post some more pics when lights turn on later tonight


Any suggestions is greatly appreciated
View attachment 197704 View attachment 197705

How do they look 5 minutes before the lights come on?

 

[jack96]

How do they look 5 minutes before the lights come on?

same its curled up at the edges
currently leaf vpd is at .9kpa they got a little better but still showing curling
im gonna give it another day to see if they get even better if not next step will be to lower ac and try to hit .8kpa

 

[jack96]

just wanna give an update
curl is going away in some areas
some are still there but way less then before
vpd is around .74-.85

guess this cut likes the lower vpd

Just kind of worried for pm with it being this low

 

[RookieBuds]

My opinion? Some plants just do that 🤷🏻‍♂️. I've ran a couple plants thru veg and flower doing exactly what yours is doing, everything turned out fine and the plant showed NO other symptoms of anything, not even a burnt leaf tip.

Could be extra sensitive. Could be something going on in the substrate as well. If the plant is otherwise healthy and you're certain all your conditions are good (based on everything you posted, seems to be) I say just let 'er rip 👍👍

 

[jack96]

Got another update and I think I already found the solution to my next issue


Top leafs look bad but as you can see 95% percent of curl is gone

Today was feed day thought maybe its lacking some mag so upted the calmag in todays feed
Ec in 2.5 ph 6.0
Ec out 3.0 ph 5.6

Btw I think the leaf tip burn was due to VPD being to high and not a nutrient burn

Hoping the issue is just that to low of a ph in media gonna hit it with 6.4 ph next feed to bring it back up and hopefully fix this issue

Any thoughts is greatly appreciated

 

[Smokieokie]

Here's my 2 cents, take it for what you want.
I don't see any fans on walls so I'm skeptical about good airflow. Your temps for led is too low for correct vpd. Bump it up to 81 or 82 and set humidity at 58-60%. That will hit at 1.1-1.3 kpa right at the sweet spot. Another thing I see is the leaves curling down like clawing, especially under the mini split. That's because it's too cold and plants are trying to protect themselves. One more thing, I don't think plants at that stage can eat up 1500ppm of CO2, that seems really high to me. That's my opinion but to be honest it looks really good in there. 👍💪

 

[jack96]

Here's my 2 cents, take it for what you want.
I don't see any fans on walls so I'm skeptical about good airflow. Your temps for led is too low for correct vpd. Bump it up to 81 or 82 and set humidity at 58-60%. That will hit at 1.1-1.3 kpa right at the sweet spot. Another thing I see is the leaves curling down like clawing, especially under the mini split. That's because it's too cold and plants are trying to protect themselves. One more thing, I don't think plants at that stage can eat up 1500ppm of CO2, that seems really high to me. That's my opinion but to be honest it looks really good in there. 👍💪

I have 6 fans in there
Moves a lot of air so I’m not really worried about airflow

Co2 was lowered to 1200

The clawing/droppy leafs are the same through out the whole room
But yes it is a few degrees lower on the leaf temps on that first tray under the mini split

I’ll give it a another day or 2 before I change any temps/ rh