Why are my leaves doing This. Clawing and cupping Down!!!

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tslonige

Well-Known Member
A Nitrogen toxicity is the result of the plant getting too much Nitrogen (usually from too high levels of nutrients overall, or by using a Vegetative nutrient in the flowering stage). It causes dark green leaves and curled tips (“the claw”).
One of the main symptoms of an Nitrogen toxicity is curled tips (“the claw”)
This marijuana plants has been fed too much nitrogen
 
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Mitchician

Well-Known Member
I think those leaves want more photons. The others are right about the clawing coming from too much N, but it's likely that it's the right amount of N going in, but because the plant's not seeing enough light, it's not using it, so it builds up, and slowly becomes too much. If I'm right, the worst leaves will be the ones furthest from the light, and the ones closest to the light will look healthy and flat with no claws or droopy edges. It could also be a case of your medium coming into a better pH range, which is unlocking nutrients that weren't previously available to the plant. Could also be a combination of these factors or something else altogether lol but hey that's why we ask right? To get the general consensus on things? Either way it's not a major.. Bit of a flush and a light feed + give her more priority under the light if she's been 'sitting in the corner'.
 
SickboyDilligaf

SickboyDilligaf

Well-Known Member
Mitchician said:
I think those leaves want more photons. The others are right about the clawing coming from too much N, but it's likely that it's the right amount of N going in, but because the plant's not seeing enough light, it's not using it, so it builds up, and slowly becomes too much. If I'm right, the worst leaves will be the ones furthest from the light, and the ones closest to the light will look healthy and flat with no claws or droopy edges. It could also be a case of your medium coming into a better pH range, which is unlocking nutrients that weren't previously available to the plant. Could also be a combination of these factors or something else altogether lol but hey that's why we ask right? To get the general consensus on things? Either way it's not a major.. Bit of a flush and a light feed + give her more priority under the light if she's been 'sitting in the corner'.
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It’s under a 650w light. 4 cobs and LEDS. Philzon 2000 cob. It’s not the light. Maybe not enough in veg. Had it under cfls
 
Nizza

Nizza

Well-Known Member
when your medium gets dry, salinity increases
Anytime i get a slight tip burn its usually not me overfeeding, it's improper watering.
sometimes soil loses its moisture retention and has to be helped out with some wetting agent like soap or silica
If you're feeding I would back off

hard to give advice with just pictures and no info on the grow parameters and what you've been doing
 
MrToad69

MrToad69

Well-Known Member
I think this is pretty straight forward for you..Your primary problem is one of two things, as mentioned; it's either water logged or just a touch too much N...Buy one of those cheap probe moisture meters and that should help you narrow down the either/ or..

Toad
 
kroc

kroc

Well-Known Member
MrToad69 said:
I think this is pretty straight forward for you..Your primary problem is one of two things, as mentioned; it's either water logged or just a touch too much N...Buy one of those cheap probe moisture meters and that should help you narrow down the either/ or..

Toad
Click to expand...
Just piggybacking off this and suggesting to just use a chop stick or piece of wood. Much cheaper and just as effective imo.
 
Hydro4life

Hydro4life

Well-Known Member
Mitchician said:
I think those leaves want more photons. The others are right about the clawing coming from too much N, but it's likely that it's the right amount of N going in, but because the plant's not seeing enough light, it's not using it, so it builds up, and slowly becomes too much. If I'm right, the worst leaves will be the ones furthest from the light, and the ones closest to the light will look healthy and flat with no claws or droopy edges. It could also be a case of your medium coming into a better pH range, which is unlocking nutrients that weren't previously available to the plant. Could also be a combination of these factors or something else altogether lol but hey that's why we ask right? To get the general consensus on things? Either way it's not a major.. Bit of a flush and a light feed + give her more priority under the light if she's been 'sitting in the corner'.
Click to expand...
Totally agree Mitchician! I’ve experienced this with the the parts of my scrog canopy furthest away from the light. Gave them a little more light so plant could convert the nitrogen and leaves lightened, clawing went away.
wasn’t an excess of nitrogen in the feed, but lack of light that was causing the slight nitrogen toxicity! Good call man!
 
U

ubluntu

Active Member
I usually foliar with a PK Booster if i see clawing leaves. Prevents the brown blotchyness that follows, Also cut back on N ofcourse.
More light is interesting. Makes sense the plants require more nutrients to process more light
 
Hydro4life

Hydro4life

Well-Known Member
ubluntu said:
I usually foliar with a PK Booster if i see clawing leaves. Prevents the brown blotchyness that follows, Also cut back on N ofcourse.
More light is interesting. Makes sense the plants require more nutrients to process more light
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If your getting brown blotching, your ph may simply be a little low as phosphorus is absorbed at the higher side of the ph range whereas nitrogen has a fairly large ph range.
This is a good example of why letting your ph drift a little is important if growing in hydro. 8-)
 
SickboyDilligaf

SickboyDilligaf

Well-Known Member
Hydro4life said:
Totally agree Mitchician! I’ve experienced this with the the parts of my scrog canopy furthest away from the light. Gave them a little more light so plant could convert the nitrogen and leaves lightened, clawing went away.
wasn’t an excess of nitrogen in the feed, but lack of light that was causing the slight nitrogen toxicity! Good call man!
Click to expand...
It’s under a Philzon 2000 Cobb. Lights not the problem —- brown spots are from neem oil that dripped on them during lights on I believe. N/ tox and ph where my problems I believe. To much humidity at lights out for my taste also. Brought in my dehumidifier. But these puffy leaves around budds ??? only on 1 off 3 plants. (1st photo). Feeding identically. Other 2 are good
 

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Mitchician

Well-Known Member
SickboyDilligaf said:
It’s under a Philzon 2000 Cobb. Lights not the problem —- brown spots are from neem oil that dripped on them during lights on I believe. N/ tox and ph where my problems I believe. To much humidity at lights out for my taste also. Brought in my dehumidifier. But these puffy leaves around budds ??? only on 1 off 3 plants. (1st photo). Feeding identically. Other 2 are good
Click to expand...
Definitely too much N, that's why the buds are so leafy. Puffiness = toxicity in general.
Should have shown us more pics to start with and given more info... like the fact that it's the only one of 3 doing it, which makes a huge difference (probably is just a dud pheno, like you guessed on your other thread). I bet it's just got too much Rudy in it why it can't handle the same EC.
 
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