Leaves rolling and closing

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denverbudtender

Active Member
Just performed a flush on my plants in coco/perlite (50/50) in my outdoor greenhouse as my water softener water was not working out. Plants were healthy but showing signs of salt build up so I flushed with RO water only. Flushed 40 gallons for each 20 gallon container. Afterwards fed with my normal food line. The next day the top leaves are rolling up and closing in on itself. PH is fine and PPM coming out is around 555ppm. Temps during day are high 90-100F but at night cool 58-65F. See attached pics.
 

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Dr Smith

Dr Smith

Active Member
90-100? That is most likely the culprit. The pictures you posted indicate heat stress to my instincts.
 
Diabolical666

Diabolical666

Well-Known Member
You started with over watering damage , then now it has heat stress as well. POke holes in the soil to get the soil to dry up quicker and some air to the roots as they are sufficating. You will have some leaf damaage in the next few weeks from this, I wouldnt pull them off till you get that plant thriving again
 
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denverbudtender

Active Member
I didn't think you can over water coco/perlite as it drains right through. Maybe in larger pots (20 gallon) it can be an issue? Maybe I should transplant into new medium with smaller pots and leave plants in the shade til they recover?
 
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Dr Smith

Dr Smith

Active Member
Don't transplant while your plants are in shock! Jeez.

Just get the temps lower somehow, wait a week and reassess.
 
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denverbudtender

Active Member
Putting them in the shade outside of the greenhouse for next few days to see how they respond. Won't do anything drastic like tplanting or over feeding. Hopefully the leaves will unfold and new growth will look normal.
 
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denverbudtender

Active Member
Started two days ago after the flush and still looks the same. Watching for new growth. Seems similar to Tomato Leaf Roll or physiological leaf roll due to saturation of water and heat.
 
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denverbudtender

Active Member
Waited one week and have temps and humidity under control in greenhouse. But the leaf roll hasn't change and the plants seem stuck and stunted. I'm seeing some new growth today but it is growing twisted and deformed much like the top leaves that previously rolled up. Does it take longer than 1 week for the plants to recover from heat stress? I have environment under control and they are under shade cloth to be gentle on them. I have been giving them foliar spray of seaweed as well. Also feeding them with grow and micro nutrients at around 400 ppm. The larger leaves are healthy just doesn't seem to be growing at all.
 

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OG Gardenz

OG Gardenz

Active Member
yucca and silica would be good to add to the regimen.. both help with heat stress and are great food for microbes. i use a soluble yucca and silica

foliar spraying kelp should bring them around... could try adding fulvic acid to the spray, this helps it penetrate into the leaf...

my bet is humidity v's temp v's rootzone was what caused the leaf curl, but also check for pests in the soil, like fungus gnat larvae or worst case scenario root aphids.
 
Merlot

Merlot

Well-Known Member
Greenhouse grow in the height of summer = baking hot. Mine are the same. Hits 50c+/120f+ in mine if outside temp is over 30c. Watering every 2 days is a must. Won't solve the leaf curl (they'll always curl in such heat no matter what you give them), but it will keep them alive.
 
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denverbudtender

Active Member
Brought in a portable swamp cooler and bought new high velocity fans and installed as intake and exhaust at the highest point on each end. Could this be a water issue? Using RO system after water softener, ppm is 10 after RO treats it.
 
OG Gardenz

OG Gardenz

Active Member
i think its transpiration which is how much water your leaves give off in conjunction to the humidity air temp and root zone
 
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denverbudtender

Active Member
Plants haven't been drinking so I removed the plant from the pot and found the coco/perlite to be soggy wet and stagnant. Transplanted into fresh coco/perlite to see if they were being suffocated by the water and therefore not drinking. They are displaying new growth but it is deformed - twisted with margin roll.
 
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