Nitrogen toxicity

Got plants in veg which are dealing with nitrogen toxicity. Was too keen with the feed when they was young. I lowered the feed but still aren't looking lighter and have clawed leaves.
Will just a one flush fix the problem? How long after will I see an improvement? Going to flush them then slowly reintroduce nutes.

The marks on the odd lower leave. Would that just be burn from too much nitrogen?

Had the same issue with mine, accidentally measured out the wrong nute when feeding. I did a flush with 4 gallons and ff sledgehammer, and all is good now. Noticed recovery within a few days. Good luck.

I have found once the toxicity is there, the leaves will not usually recover but the new growth should show less signs of the nitrogen toxicity in them. Though your lower leaves look less clawed. Do you have a strong fan running on them. They can claw too from a strong fan. Here is a picture of real toxicity for you. See how dark green the leaves are, compared to new growth.

Thanks for the replies. I have a clip on fan in the tent but certainly ain't blowing directly at the plants. I have two strains in the tent and one strain seems more a less fine. It has dark leaves but not the clawing so have just drastically dropped the feed.

The clawing plants just look ugly as fuck and can you also see the mark on the lower leave? A few seem to have that. Is that just burn from too much nitrogen?

Every plant in the tent is going to get a good watering with plenty of run off with nothing but 0.8ec. In the hope they use some of the stored nutes. Then slowly increase the feed and hoping that should see the new growth growing without any issues? Sound like the right idea?

Wondering how long until everything is growing and looking okay as I'm desperate to just flip these.

Driving me crazy to have to look at the ugly fuckers lol . Ain't even laughing so dunno why i put the lol.

The marks on the leaves, would that be nute burn? I thought that would just be like orange burn at the tips. Notice some the lower leaves have marks on them and also some yellow. So if not burn from the excess nitrogen I'm wonder could it be suffering with cal/mag?

Also I have given the plants a watering with loads of run off. Gave a really light dose of nurse with it at only 0.8 ec.

Any ideas on if what I have done sounds like the right way to go about it? Just want these in flower and out the way so can crack on the next and not have any fucking issues. I know if I put these into flower now I'm just gonna end up with shit bud ain't I. The other strain in there look fine, leaves look bit dark n almost waxy but cut back their feed to 0.8 as well. Will bump it up slightly next watering.

ninja1 said:

Driving me crazy to have to look at the ugly fuckers lol . Ain't even laughing so dunno why i put the lol.

The marks on the leaves, would that be nute burn? I thought that would just be like orange burn at the tips. Notice some the lower leaves have marks on them and also some yellow. So if not burn from the excess nitrogen I'm wonder could it be suffering with cal/mag?

Also I have given the plants a watering with loads of run off. Gave a really light dose of nurse with it at only 0.8 ec.

Any ideas on if what I have done sounds like the right way to go about it? Just want these in flower and out the way so can crack on the next and not have any fucking issues. I know if I put these into flower now I'm just gonna end up with shit bud ain't I. The other strain in there look fine, leaves look bit dark n almost waxy but cut back their feed to 0.8 as well. Will bump it up slightly next watering.

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I dont see much of a Nitrogen toxicity to be honest.
Not dark enough, and leafs will get really shiny and waxy.
The lower yellow/brown leafs looks like a phosphorous deficiency to me.
Good luck!

ÒÒlegilizeitÒÒ said:

I dont see much of a Nitrogen toxicity to be honest.
Not dark enough, and leafs will get really shiny and waxy.
The lower yellow/brown leafs looks like a phosphorous deficiency to me.
Good luck!

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Thanks for the reply. The camera might not be the best tbh, the leaves are certainly dark. Waxy sums it up perfectly. Some of the leaves look rubbery and have that shine to them. Spot on there even though photo doesn't show it. What lead me to think N toxicity was the clawing but yeah 100% got some waxy shiney leaves. I upped the feed bit too much when they was looking hungry when I got the cuts. Was just desperate to get em green so went higher with feeds than I usually would.

Could the N toxicity causes a phosphorus deficiency? Will have a look at phosphorus deficiency on Google as to how to treat that if it appears to be that.

Far as the N toxicity, clawing, waxy leaves. I have given every plant a watering with 0.8ec and a lot more run off than I usually aim for. Also had the pots raised so they wasn't just sitting in what came out. Will that do the job in having the next leaves not have the clawing? Really want to get these flipped and be done with em. Rather be growing something I ain't messed up n be stress free. Seriously feel desperate to get these sorted and on the way to finishing. Thanks a lot for the reply is much appreciated.

ninja1 said:

Thanks for the reply. The camera might not be the best tbh, the leaves are certainly dark. Waxy sums it up perfectly. Some of the leaves look rubbery and have that shine to them. Spot on there even though photo doesn't show it. What lead me to think N toxicity was the clawing but yeah 100% got some waxy shiney leaves. I upped the feed bit too much when they was looking hungry when I got the cuts. Was just desperate to get em green so went higher with feeds than I usually would.

Could the N toxicity causes a phosphorus deficiency? Will have a look at phosphorus deficiency on Google as to how to treat that if it appears to be that.

Far as the N toxicity, clawing, waxy leaves. I have given every plant a watering with 0.8ec and a lot more run off than I usually aim for. Also had the pots raised so they wasn't just sitting in what came out. Will that do the job in having the next leaves not have the clawing? Really want to get these flipped and be done with em. Rather be growing something I ain't messed up n be stress free. Seriously feel desperate to get these sorted and on the way to finishing. Thanks a lot for the reply is much appreciated.

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Sure sounds like nitrogen toxicity then
I dont know enough about the science behind these, but it could definitely potentially lock out phosphorus.
I wouldn't sweat it too much, you seem to be doing a good job

I see major N tox, the clawing is first sign, your feeding to frequently, less feed more water

ÒÒlegilizeitÒÒ said:

Sure sounds like nitrogen toxicity then
I dont know enough about the science behind these, but it could definitely potentially lock out phosphorus.
I wouldn't sweat it too much, you seem to be doing a good job

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Yeah I'm confident its N toxicity. The plant in the photo was one of the worst in terms of clawing. Was two really bad and I just gave them a water with plenty of run off with nothing but ph'd water the day before. Spoke with a mate and he said no need for that just give a low dose of feed. Hence all the rest have had the nutes dropped to 0.8ec with plenty of run off and will increase that next feeding to slightly higher.

I think you may be right about it being a phosphorus issue too. Reading online the watering with plenty of run off sounds like it should have also done that good. I had also calibrated the ph pen before the watering. It wasn't out anyway as a fairly new pen but wanted to be sure.

I guess all I can do now is sit and wait and see how the plants look in the next few days. To see if looks like they are getting worse or better. Funny how the other strain in there isn't as badly effected. Dark n odd shiney leaf but none of the bad clawing which looks so ugly. Just praying this heavy feed with lower nutes does the job as I'm hoping to flower within a week max. If not improved by then I may have to just bin these plants and just flower under one light the 4 which look decent.

kovidkough said:

I see major N tox, the clawing is first sign, your feeding to frequently, less feed more water

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When I got that cuts I went into pots too big. Took a while to dry out for the next watering so by them they was bit hungry looking. Desperate to just get them green again I 100% gave more feed than I usually would. I thought at the most I would see a bit of nute burn and would back off. Instead I have ended up with nitrogen toxicity. Reading online it sounds like quite an easy problem to fix? Just give enough water to flush out the coco holding too much N. Well have started to do that now. So guess all I can do is wait and see if the new growth is better. Just driving me crazy to look at the ugly fuckers lol . Wasn't too long ago I was opening the tent and happy with all the leaves looking great.

ninja1 said:

When I got that cuts I went into pots too big. Took a while to dry out for the next watering so by them they was bit hungry looking. Desperate to just get them green again I 100% gave more feed than I usually would. I thought at the most I would see a bit of nute burn and would back off. Instead I have ended up with nitrogen toxicity. Reading online it sounds like quite an easy problem to fix? Just give enough water to flush out the coco holding too much N. Well have started to do that now. So guess all I can do is wait and see if the new growth is better. Just driving me crazy to look at the ugly fuckers lol . Wasn't too long ago I was opening the tent and happy with all the leaves looking great.

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feed at a lower EC

I'm new but I've been reading and reading and reading for months now.... I've concluded it is possible to have multiple deficiencies going on at once, and looking at your pic, the clawing is definitely there pointing to N, but might be more going on.

For example, high levels of nitrogen can cause a potassium deficiency. Applying nitrogen to increase yield requires more plant-available potassium in the soil; without the sufficient amount of potassium, the response to nitrogen application will be limited. And, high levels of phosphorus can reduce the availability of potassium, resulting in a deficiency in the crop.

ninja1 said:

Got plants in veg which are dealing with nitrogen toxicity. Was too keen with the feed when they was young. I lowered the feed but still aren't looking lighter and have clawed leaves.
Will just a one flush fix the problem? How long after will I see an improvement? Going to flush them then slowly reintroduce nutes.

The marks on the odd lower leave. Would that just be burn from too much nitrogen?


View attachment 4786970

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To much N and a Ca def. best wishes with your grow.

Excess of one element can lock out others. Keep this handy and trouble shooting gets a lot easier...

Thanks for the messages. I agree is N toxicity and another deficiency going on. I know my ph pen has been on point. So the deficiency must have been caused by the excess nitrogen. Have given a much lower feed like I say, only 0.8ec. That I am hoping takes care of the clawing leaves.

I will take some better photos of leaves I think suffering with deficiency so then people can say if they think it is a phosphorus deficiency or a calcium deficiency. I am sort of leaning more towards calcium tbh but course want to be as sure as possible. Will get some photos up of the leaves.

Thanks a lot for the replies. Puts my mind at rest to least get an idea of what's going on so can get on the path of fixing it. Want everything looking right before I put these into flower.

What deficiency do people on here think? Phosphorus or calcium? Seeing as it seems those two are common deficiencies when suffering with excess nitrogen.

I wish the flash on my camera worked. For some reason with the black the images just come out black. Gonna Google that n see what colour be wrong with the camera. With the flash though you would see the green on the leaves has got a waxy shine to it. Deffo suffering with N toxicity.