Nitrogen toxicity?

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ThatOneDudeWhoNeedsHelp

Member
Got a few auto gorilla cookies two weeks into flowering.

Two of them have started clawing a bit, i'm thinking nitrogen toxicity?

The one in the pictures is especially bad with almost all the leaves tips being curled down and all fan leaves curling in downwards.

Any tips? I use PH perfect nutrients, been giving 2ML/L of grow, bloom & micro in each watering.

They get fed every 2/3 days since the place i live at for the moment is a consistant +30-31c and the soil is well dry by the point i water them.

I'm thinking about flushing, is it a good idea at this stage of flowering? Perhaps only give water for a week first to see if they fix themselves?

They were fed just today, a few hours ago. 1L of water mixed with nutrients as usual each. Pots have maybe 7-8L of soil in them.

IMG_20230728_185627.jpgIMG_20230728_185604.jpg
 
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ALPHA.GanjaGuy

Well-Known Member
it does look like it. you mention grow/bloom/micro, which brand? biobizz? 2ml/l should be fine at this stage, I would probably pull back on the grow for a few feedings
 
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ThatOneDudeWhoNeedsHelp

Member
ALPHA.GanjaGuy said:
it does look like it. you mention grow/bloom/micro, which brand? biobizz? 2ml/l should be fine at this stage, I would probably pull back on the grow for a few feedings
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Yeah i'll probably just give em water for a bit then, probably not a critical situation yet? To my understanding leaves CAN recover from nitrogen toxicity when it's not gone too far?
 
hotrodharley

hotrodharley

Well-Known Member
ThatOneDudeWhoNeedsHelp said:
I've given them water every 2-3 days. At this point it's about 1L of liquid each.
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You should use at least 20% of your container volume even with peat mediums. I’m thinking your feeds are not reaching the bottom each time. Flushing might help the clawing but suggest you increase the volume by double considering coco is involved.
 
Billy the Mountain

Billy the Mountain

Well-Known Member
ThatOneDudeWhoNeedsHelp said:
Oh? Good to know, i've actually always used the same exact growing medium combo and never had issues relating to it.
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If you're actually grinding coco to a fine powder, you ruin the structure that gives coco the unique property of holding ample air while fully saturated.
The finer the coco, the less air it can hold.

You should be feeding with each watering (fertigating) to 10-20% runoff; coco should never be allowed to dry, unlike soil.

cocoforcannabis.com is a good resource for learning about coco.
 
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ThatOneDudeWhoNeedsHelp

Member
hotrodharley said:
You should use at least 20% of your container volume even with peat mediums. I’m thinking your feeds are not reaching the bottom each time. Flushing might help the clawing but suggest you increase the volume by double considering coco is involved.
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Water does run off from the bottom every time, just a little bit. Maybe 50ML or so.

Do you think the nutrients themselves are not getting all the way down?

That sounds a bit weird but i'm not a pro for sure. I've used the same exact nutrients and growing medium before and never had nitrogen toxicity happen. First time doing Gorilla Cookies though.

Next time i water, in 2 days i'll give water only and double the amount, so 2L?

After a 5-7 days i'd expect the leaves to fix themselves up?

Just worried about malnutrition during this since they're flowering already.
 
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ThatOneDudeWhoNeedsHelp

Member
Billy the Mountain said:
If you're actually grinding coco to a fine powder, you ruin it's structure that gives coco the unique property of holding ample air while fully saturated.
The finer the coco, the less air it can hold.

You should be feeding with each watering (fertigating) to 10-20% runoff; coco should never be allowed to dry, unlike soil.

cocoforcannabis.com is a good resource for learning about coco.
Click to expand...
Ok yeah, definitely going to look into it. I've been doing it wrong the whole time it seems. :D I do get maybe a 5% runoff every time i water, and i've watered pretty much when the pots feel light and dry on the surface.
 
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ThatOneDudeWhoNeedsHelp

Member
BongerChonger said:
Seems sensible.
Are you following the manufacturer's feed chart, for flower?
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I'm actually using a little bit under the feed chart. They tell you to give 4ML/L of each for mature plants and 2ML/L for plants with 3 - 4 sets of leaves.
I've been giving 2ML/L the whole time after i started feeding.

To add to this, i've been using the same amount in my second grow tent with other strains too, (You can see them in the background actually.)
None of them are showing similar symptoms.

It seems this is only happening with my gorilla cookies specifically. I'm guessing the strain is very specific on its nitrogen amount perhaps?
 
BongerChonger

BongerChonger

Well-Known Member
ThatOneDudeWhoNeedsHelp said:
I'm actually using a little bit under the feed chart. They tell you to give 4ML/L of each for mature plants and 2ML/L for plants with 3 - 4 sets of leaves.
I've been giving 2ML/L the whole time after i started feeding.

To add to this, i've been using the same amount in my second grow tent with other strains too, (You can see them in the background actually.)
None of them are showing similar symptoms.

It seems this is only happening with my gorilla cookies specifically. I'm guessing the strain is very specific on its nitrogen amount perhaps?
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Cool!
I was just wondering. Some people like to feed veg nutes for first couple weeks, then start flower nutes after.
 
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