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Thread: Nitrogen overfeed in flower advise needed

  1. #1

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    Default Nitrogen overfeed in flower advise needed

    I'm in my 7th week of 12/12 for my critical plants and my leaves are very dark green. I now know this to be a sign of nitrogen over feeding which was caused by me using an a&b from a different company. I was using canna without any problem and tried plant magic which it turns out is way too strong.

    Realising the issue, I flushed the coco and swapped to canna again about 10 days ago. I've dropped the ec to about 0.8 but the leaves wouldn't get lighter so now I'm at about 0.8ec but made up of hardly any a&b base nutes and mostly green planet massive 1/1.5/2.8 npk and some canna pk 13/14.
    My theory being to reduce the amount of N in the solution, forceing the plant to use up its stored N but still provide plenty of P and K while in this later stage of flower.

    Am I over complicating all this or has anybody got a better idea of how to reduce the stored N in my plants? Obviously too high N disrupts the flowering process which is what I'm trying to avoid.

    Thanks for reading all this

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    Hi, this is where I am currently at with the excess nitrogen. Edges of the leaves are slightly turned up


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    They are certainly well stocked with N. Unless you have any signs of burning then I wouldn't worry at this late stage.

    Have you got any leaf tips curving to one side or leaves clawing downwards? That would suggest nitrogen overdose. Without those changes in form (not just colour) I wouldn't worry too much.

    Your plants will have very little N requirements at this stage so unlikely you will lighten them very quickly.

    Use plenty of the pk and less base like you say. You can't fully eliminate your base Nutes because they contain micro nutrients that if cut totally may have an even worse effect on end result.

    How many weeks are you expecting flower to last with this strain?

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    I didn't look close. You can see the curved leaf tips.

    It's not a major overdose though mate. Better than them being yellow anyway.

    Also when you run a week or two flush before the chop you should get some lightening up.

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    Quote Originally Posted by greengiant View Post
    I didn't look close. You can see the curved leaf tips.

    It's not a major overdose though mate. Better than them being yellow anyway.

    Also when you run a week or two flush before the chop you should get some lightening up.

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    I'll use a minimal amount of a&b with the green planet massive as the bulk of my nutes then. Been a steep learning curve this time out
    Last edited by Toke monkey; 01-05-17 at 07:21 PM. Reason: Auto correct

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    Soz greengiant, but I have to disagree

    This will cause retarded flowering - Flush them with plain water at 2x the pot size
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    Quote Originally Posted by M_C View Post
    Soz greengiant, but I have to disagree

    This will cause retarded flowering - Flush them with plain water at 2x the pot size
    Ok. What should I feed them after? Half strength a&b or the green planet massive or pk? Cheers

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    Quote Originally Posted by M_C View Post
    Soz greengiant, but I have to disagree

    This will cause retarded flowering - Flush them with plain water at 2x the pot size
    You're right mate but at this stage there isn't much he can do. It will take two weeks to get it to use it up won't it?

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    Quote Originally Posted by greengiant View Post
    You're right mate but at this stage there isn't much he can do. It will take two weeks to get it to use it up won't it?

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    Hmmm... you have a point

    I can see you costing me another 50p in the future

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    Gents. Just flushed. What would you recommend for the final 2 weeks till flush?
    Thanks for your help

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