reoccurring N toxicity

Had a bit of N toxicity but nothing major. Just knew it was that by the clawing leaves. Anyway flushed with a light feed and the issue went away, leaves started looking normal. Slowly got the feed back up a bit and plants was looking fine. Just increased the feed by 0.2ml per litre and not feeding a crazy amount. Suddenly clawing leaves again. Now my mates using the same nutes and cuts and was giving his more during this stage. Also I have done in the past tbh.

Am wondering to completely get rid of nitrogen toxicity can it take more than one flushing with a light feed? Leaves returned to normal but wondering does it still have high levels stored or something?
They really aren't the worse looking at all but am thinking in the future I'm gonna have to increase the feed. Will I just see the problem come back each time I go past the 1.5ml per litre I am giving them. They are being fed canna coco by the way.

Like I say ain't the worst looking and tbh I just want this grow down so can crack on with the next lot. It's more just thinking will they need more than the one flush. The leaves returned to normal, they will want more food in the future and seems like go above what I am giving them and the problem comes back. Yet it isn't even much feed tbh to warrant N toxicity.

May be some root damage. Let them dry out between waterings & ph your nute solution

Thanks for the reply. I'm in coco so not wanting to let it dry out, only really just got the hang of watering it like coco rather than soil lol . Was proper happy about that and how they was looking.
This isn't the worst case of N toxicity, seen far worse online. I actually had it last time as well, down to me treating the coco like soil. Let it get to dry and waiting to long for that to happen so plants got hungry and I was to keen.
This time round was just pure stupidity on my part and being to keen. I gave them what my friends giving the same cuts but his ahead weeks into flower.

UPDATE:
Watered them yesterday with a weak nute feed and got decent amount of run off. Now I done that before and the leaves looked way less curled. So then I tried to slowly increase the nutes to get them back to a range I'd expect them to be. Curling appeared again, I am wondering has the plants stored excess as I over Fed them and I should keep them on lower nutes than expected until they start to look hungry then increase it? I took them out the tent to see them in natural light yesterday before watering. They all still looked dark, darker than they appeared in the tent.

So yeah, keep on lower than expected for a plant their size level of nutes till they look like they need more? As they are all dark looking. Even when the leaves straighten up n improve I think they stay dark.

Give another flush and then go back to increasing the feed slowly until I get to where they should roughly be for size and age?

Thinking to stick with the first and read the plants themselves rather than just going based on what I expect. I already tried the flush then slowly increase and saw the problem return.

Thanks guys

If they respond well to weak feed then do that for a week then start uping the dose

Plants respond differently to the same shit. Feed it it how it responds best even if it is different from the others.

Darkoh69 said:

If they respond well to weak feed then do that for a week then start uping the dose

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Thanks I think I am going to do that. They seem to have improved but still some curling going on.I know they might not even recover but overall I think I can see an improvement from the weak feed. Going to keep it weak a little longer than just 1 watering like I done last time. Also gonna give it a watering and get even more run off to be sure I have pushed out excess nutes. Then slowly increase things over time. They was looking okay for a while it was only when I went a little higher they seemed to curl again. They wasn't given a strong feed either but I guess they didn't need even that much as was still dark.

I guess they can get away with being given a weaker feed than usually required for a plant that size because of having the excess nutes stored from the high feed? They wasn't looking hungry at all, still quite dark. I just thought to increase the feed as it was really weak for a plant of that size. I guess if it doesn't need it though just read the plants.

Still in veg im guessing?

Darkoh69 said:

Still in veg im guessing?

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Sorry for the late reply. Nope I flipped them into flower and noticed the N toxicity came back after about 3 days in. Just passed a week of flower and yesterday I gave them a weak water with loads of run off. A lot more run off than usual thought I better just go for it and hope it sorts the problem. Will see how they looking over the next day or two.

They was fine before i flipped them, in terms of no clawing. Leaves was still quite dark though I think, in the tent the light doesn't always show the colour the best. When I took them out after seeing some clawing though they looked darker than they appeared in the tent.

I think where I went wrong may be was not completely using up the excess nitrogen? Or was a mistake to just try get the nutes to where a plant that size should be. Rather than actually reading the plants themselves. As I say they was probably still dark and didn't need no increase in the nutes.

Hopefully now it will sort it. Had the problem once before and I did manage to get it to go away.

Even after the flush with a weak feed. I still have leaves curling down? Is it possible that these leaves just won't recover? Gave them another weak feed today but I know they can't stay on it forever.
Should I flush with an even weaker feed? Literally only gave them what I give seedlings.

Need to know if the leaves will or won't recover? Before I slowly start to increase the feed to where it should be.

ninja1 said:

Even after the flush with a weak feed. I still have leaves curling down? Is it possible that these leaves just won't recover? Gave them another weak feed today but I know they can't stay on it forever.
Should I flush with an even weaker feed? Literally only gave them what I give seedlings.

Need to know if the leaves will or won't recover? Before I slowly start to increase the feed to where it should be.

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The leaves probably won't recover. If they're really clawed they'll likely stay that way. Continued flushing is going to do more harm than good.

Do you recognize the difference between potassium deficiency and nitrogen toxicity?

hotrodharley said:

Do you recognize the difference between potassium deficiency and nitrogen toxicity?

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It's nitrogen toxicity, dark waxy leaves. Although they have got better since the flush. It's just still a little clawing on the leaves. Wondered if they will improve or just gonna stay like that.
I have had them improve before and even these are looking better but yeah just still the clawing.

Gonna bump the feed up slow as fuck and hopefully they don't get worse.

xtsho said:

The leaves probably won't recover. If they're really clawed they'll likely stay that way. Continued flushing is going to do more harm than good.

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They aren't the worst, looking better from the weak feed flush. Just not looking proper healthy like I've has plants go before when I had N toxicity. Mind you I was in veg during that time.

Just a quick update.

Had n toxicity and flushed with a weak feed. Leaves went straight n lost the curling so next feed I increased from the weak feed but still not strong as should be. The curling came back and reason is the curling was gone but dark leaves still there. Should of read the plant rather than just going by text book thinking of what a plant it’s size needs.

anyway gave a few feeds with the lower amount of nutes. To the point the plants started looking hungry. Have since started to increase the food and got to the stager where I am giving them more than they got last time when the curling leaves came back. So all is good I’d say and plants only 3 weeks in as of tomorrow and absolutely stink already.

Pics? What EC and pH?

You don't have to give weak nutes just for N toxicity. Just cut back the N and boost the P K or give weak feed with P K booster (Kool Bloom).