Leaves curling up bad. (Newbie Grower)

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daveros34

New Member
Hi all.
Any help or tips on this matter would be very welcome.
I have some Bubble Kush seedlings, all are displaying the same symptoms.....Fan leaves curling up and going shiny.
I have a 2.2 x 1.2 x 2m grow space, 2 x 600 watt hid lights....1 x intake 8" fan 1 x 8" extraction fan...3 12" circular fans to move air about.
My temps at canopy level are 75-76 C but RH is at 35 at the moment.
I have struggled with them for a couple of weeks now. They are growing slowly but the new growth lasts a day or 2 then curls.
Im using a 75% coco 25% perlite pot mix i made. My PH of nutrients when i feed is 5.8 - 6.0.
I am using 1.5 ml canna A + B 1 ml Rhizotonic and 1 ml canazym to every litre of water.
I water usually every 3-4 days. Lights are on 18 - 6 .
I have never had this trouble on my last few grows (i have never done 1 this time of year before....nothing to do with low RH maybe? )
I have attached a few pics to show whats going on with the plants.
Cheers Guys
D
 

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fabizpwn

fabizpwn

Well-Known Member
I have a couple bubba kush plants also that did the same exact thing when i started pumping nutes to them in flower. I think you might need to lay off the nutes and just give them the rooting enzyme. I'm pretty sure this was my issue as they were the only plants to do this out of 13 strains. I set them off to the side and have been giving straight water since last watering seeing if they might recover. I'll sub your post an update you if I see any changes for the better. Mine are pretty well fried though.
 
canadianbuds

canadianbuds

Member
could be heat stress high heat temps can do this to your leaves and make sure your fans aren't directly blowing on the plants what's your watering schedule for them ?
 
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daveros34

New Member
cheers guys for all the input ill try and implement some of these tips ...ill post later with an update if i can get them back on track.......once again thanks guys :lol:
 
Resinhound

Resinhound

Well-Known Member
Heat/intensity stress,people also need to remember when your humidity is low,it will cause the plant to transpire more effectivley raising nutrient concentrations in the plant,not nessessarily a bad thing as long as you take that into account.

Abstract
Young plants of nine different greenhouse species were grown for 24 to 100 days at 55–60, 70–75, and 90–95% relative air humidity (RH) in growth rooms. They were given a complete nutrient solution twice a week. Transpiration rate decreased significantly by increasing RH from the lowest to the highest level inEuphorbia pulcherrima (60%), Begonia × hiemalis (54%), Saintpaulia ionantha (54%), Nephrolepis exaltata (48%), andLycopersicon esculentum (44%). The content of macro nutrient elements in the plant leaves decreased by increasing RH. This decrease was significant only for K and Ca in Lycopersicon and Kjeldahl-N in Nephrolepis. The content of the macro nutrient elements in the growth medium at the end of the experiment was lowest when the plants had been growing at high RH. The elements mainly affected were N and K.

For best growth ,50-60% humidity in veg,30 or less in flower to prevent molds and fungus.Temps/humidity and nutrient uptake are all intertwined.Recent studies show that cannabis sativa prefers temps in the range of 77-82f
 
Last edited:
getdown76

getdown76

Well-Known Member
daveros34 said:
Hi all.
Any help or tips on this matter would be very welcome.
I have some Bubble Kush seedlings, all are displaying the same symptoms.....Fan leaves curling up and going shiny.
I have a 2.2 x 1.2 x 2m grow space, 2 x 600 watt hid lights....1 x intake 8" fan 1 x 8" extraction fan...3 12" circular fans to move air about.
My temps at canopy level are 75-76 C but RH is at 35 at the moment.
I have struggled with them for a couple of weeks now. They are growing slowly but the new growth lasts a day or 2 then curls.
Im using a 75% coco 25% perlite pot mix i made. My PH of nutrients when i feed is 5.8 - 6.0.
I am using 1.5 ml canna A + B 1 ml Rhizotonic and 1 ml canazym to every litre of water.
I water usually every 3-4 days. Lights are on 18 - 6 .
I have never had this trouble on my last few grows (i have never done 1 this time of year before....nothing to do with low RH maybe? )
I have attached a few pics to show whats going on with the plants.
Cheers Guys
D
Click to expand...
Your leaves are trying to hold on to as much moisture as possible by curling up. So we are assuming that you RH% is on the low end. If your having problems with your humidity just spray your seedlings 2 0r 3 times a day with some ph'd R/O water and they will be fine. OOOOOr you can purchase a humidifier for $80 and give the ladies what they desire.... Good Luck...
 
fabizpwn

fabizpwn

Well-Known Member
Upon inspecting my plants, they are canoeing like yours but mine are burnt bad. I don't think your problem is a nutrient issue as I don't see any burning on yours. I agree with getdown76 as this may be a way for the plant to retain moisture as your humidity is low. Your leaves also look extremely wide which may be caused from the low humidity
Condition also. Here is a picture of my bubba plants
 

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getdown76

getdown76

Well-Known Member
fabizpwn said:
Upon inspecting my plants, they are canoeing like yours but mine are burnt bad. I don't think your problem is a nutrient issue as I don't see any burning on yours. I agree with getdown76 as this may be a way for the plant to retain moisture as your humidity is low. Your leaves also look extremely wide which may be caused from the low humidity
Condition also. Here is a picture of my bubba plants
Click to expand...
looks like a combo of heat stress, nute O.D and under watering?
 
fabizpwn

fabizpwn

Well-Known Member
Hard to say I had them in the middle of 13 other strains that are loving it, nute od yes, heat maybe...run my room at 82. If anything they were overwatered, not extremely but they weren't drying out like the other pots.
 
getdown76

getdown76

Well-Known Member
fabizpwn said:
Hard to say I had them in the middle of 13 other strains that are loving it, nute od yes, heat maybe...run my room at 82. If anything they were overwatered, not extremely but they weren't drying out like the other pots.
Click to expand...
Have you checked the bottom of the containers to make sure they arent leached?
 
fabizpwn

fabizpwn

Well-Known Member
Ok just read up on leaching real quick. I've never watered enough to actually have run off so I've never checked the ph or anything like the runoff on any of these plants. I do Straight water and feed on alternate water times. I've also never done a thorough flush either with straight water.
 
fabizpwn

fabizpwn

Well-Known Member
these 2 plants aren't too concerning to me honestly. I think they are beyond the point of repair they are already 3+'weeks into flower. These were just run on a whim to dial my room in and setup multi res rdwc.
 
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