Stunted growth up top

Discussion in 'Growing Marijuana Indoors' started by PeacePipe17, Nov 16, 2014.

  1. #1 PeacePipe17, Nov 16, 2014
    Last edited by a moderator: Nov 16, 2014
    Well im on my 2nd turn.. and the first one went very well until mid flower when i started showing the same issues you will see in the pictures. I am about to switch these to 12/12 but I am having trouble getting them healthy.
    Medium: 75% coco 25% perlite
    Nutrients: cns17 + Silica + Cal/MAg
    Lights: 2k watt over 8 plants
    Strains: Chem and Headband
    Plants age/size: 2 months/2 sq feet with many tops
    Container size: 7 and 10 gal
    Ventilation: 500 cfm
    Temp: 70-77
    Humidity: 38% (Low but a few months ago when i seen these problems it was 65%)
    Feeding: Feeding 1.3 EC for the last 2 feedings, I water once my pots are light. every other day now. I  have a very airy mix so I dont believe its an overwatering issue as i have let them dry out over the last week
           I do feed with every feeding (Your suppose to with coco) and I do believe I was over feeding for a few (like 1.5-1.7). This is what I thought the issue was the last run because it took a while to flush and get a low EC. With that being said you will see the plants have rigid edges like they are heat stressed and are dry to the touch. Now I dont have heat issues and I dont believe the humidity would be causing these issues..
    So my conclusion was over feeding but after doing a few wet/dry cycles and feeding at 400ppm (250 is tap water + Cal/mag) the problem doesnt seem to be correcting itself. Its been about a week and I really need to go into flower now.
    Any suggestions? I know your not suppose to flush coco the same way as soil but if others also think its an overfeeding problem I may flush with ph water + clearex. Then follow with a low dose feeding. The big fan leaves are dry and rough and the leaves near the top are curled under (kind of like a n toxicity) and the brand new growth is folded in like a flower opening up.
    I appreciate any input. I was stumped by this last run and apparently this run also. Also forgot to mention I have pruple stems a lot fo supplementing cal/mag and for some reason my partner hit them last week with a low dose of bush load which is a growth regulator (he thought we were going to switch to 12/12 and use that again to limit the stretch. So I suppose that could be an issue too idk thats out of my league
    happy toking


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