Leaf curling issues - Taco'ing

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RialbSelur

Member
Hey All,

Seen a bunch of threads regarding this, but looking for some additional input. I'm in 6th week of flower, and as of a few days ago, I noticed the leaves starting to canoe or taco, with some discoloration in the leaves. Started noticing the leaf issues when I added a couple new non-oscillating fans to the 4x4 tent. I've since reverted back to the oscillating tower fan I was using, but I'm not seeing an improvement.

Strains: White Widow and GSC
Media: 70/30 - Canna Coco/perlite in 3.9 gal pots
Nutrients per 5gal: Canna A&B (64ml), Canazyme (47ml), Rhizotonic (9.5ml), and Boost (50ml). I also, add in some Mammoth P (5ml) and weekly Recharge (I hand water every other morning to runoff)

Any insight would be great

Appreciate!
 

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C

cage

Well-Known Member
Can't quite put pin on the problem.
Looks like some potassium defiency with the leaf edges turning brown somewhere.
Also pretty dark green and the leaf cupping could be some magnesium def aswell.
Double check pH's
 
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harrychilds

harrychilds

Well-Known Member
It looks like it's suffering from heat stress slightly, raise your light up a few inches and see how it goes.
 
R

RialbSelur

Member
ok, all good suggestions. It's been difficult getting the RH stabilized day and night. During the day, when the light is on (Chilled Growcraft x5, btw) humidity goes down, and then as soon as it goes out, RH goes way up. I can raise the light a little, if this is the issue, but it would be easier to dial it down a bit. I'm guessing if I dial it down, then I shouldn't loose any spectrum efficacy.
 
Billy the Mountain

Billy the Mountain

Well-Known Member
Its not your light per se. Its the extremely high VPD during lights-on causing the curling

Raise RH and/or lower temp during lights-on to mitigate
 
harrychilds

harrychilds

Well-Known Member
RialbSelur said:
ok, all good suggestions. It's been difficult getting the RH stabilized day and night. During the day, when the light is on (Chilled Growcraft x5, btw) humidity goes down, and then as soon as it goes out, RH goes way up. I can raise the light a little, if this is the issue, but it would be easier to dial it down a bit. I'm guessing if I dial it down, then I shouldn't loose any spectrum efficacy.
Click to expand...
Yeah if you can control the humidity you will be a lot better off, I'm currently working on my grow setup right now and I just got a inkbird humidity controller and a inkbird temperature controller that controls everything for me, so if you are struggling with humidity and stuff I would highly recommend looking at getting a inkbird humidity controller and temperature controller :)
 
R

RialbSelur

Member
Ok, the humidity issue is making sense. Given that I'm using LED, I've been hearing quite a bit that operating temps in the mid 80's is desirable. My ppfd, currently, is ~925, so I believe that should be good. I'll concentrate on regulating RH, and see. Appreciate it.
 
Bushbaby11

Bushbaby11

Well-Known Member
RialbSelur said:
Hey All,

Seen a bunch of threads regarding this, but looking for some additional input. I'm in 6th week of flower, and as of a few days ago, I noticed the leaves starting to canoe or taco, with some discoloration in the leaves. Started noticing the leaf issues when I added a couple new non-oscillating fans to the 4x4 tent. I've since reverted back to the oscillating tower fan I was using, but I'm not seeing an improvement.

Strains: White Widow and GSC
Media: 70/30 - Canna Coco/perlite in 3.9 gal pots
Nutrients per 5gal: Canna A&B (64ml), Canazyme (47ml), Rhizotonic (9.5ml), and Boost (50ml). I also, add in some Mammoth P (5ml) and weekly Recharge (I hand water every other morning to runoff)

Any insight would be great

Appreciate!
Click to expand...
Canoeing is usually humidity/heat issue
 
hotrodharley

hotrodharley

Well-Known Member
RialbSelur said:
Ok, the humidity issue is making sense. Given that I'm using LED, I've been hearing quite a bit that operating temps in the mid 80's is desirable. My ppfd, currently, is ~925, so I believe that should be good. I'll concentrate on regulating RH, and see. Appreciate it.
Click to expand...
If you're not running CO2 I suggest turning the light down to around 800.
 
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RialbSelur

Member
I’ve got one of those Exhale mushroom bags in the tent, but not sure what kind of concentration I have in the tent. Not sure how to measure that either.
 
Hiphophippo

Hiphophippo

Well-Known Member
RialbSelur said:
ok, all good suggestions. It's been difficult getting the RH stabilized day and night. During the day, when the light is on (Chilled Growcraft x5, btw) humidity goes down, and then as soon as it goes out, RH goes way up. I can raise the light a little, if this is the issue, but it would be easier to dial it down a bit. I'm guessing if I dial it down, then I shouldn't loose any spectrum efficacy.
Click to expand...
Spray the sides of your tent with your Mister Or stick a couple pans of water in there I have to do that sometimes to raise the humidity during seedling an early veg times
 
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