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Thread: Leaf edges curling throughout plants

  1. #1

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    Default Leaf edges curling throughout plants

    As per the title...

    Growing 2 NL autos. They're about 55 days old last time I checked. A couple weeks since I first saw pistils. Growing in coco using (per litre) 1ml canna a and b, 1.5ml rhizotonic (tho stopping this one now), 0.5ml solar green silocone, 0.5ml canna bloom. Occasionally adding 0.5ml of cal mag too.

    A week ago rh spiked after watering at 72 so I quickly got a dehumidifier and got it now fluctuating between 45 and 59. Temps also got as high as 31. (Possibly higher in parts as no idea where best to keep the hygrometer). Currently it's hanging to the side of the grow so no lights or fans hitting it. I put my intake on and turned off a couple bulbs to reduce heat (using cfls).

    Any advice or observations greatly appreciated.
    Cheers talkers.

    1st plant (seems the worst effected of the two...) ec runoff keeps jumping up after each feed so have done 2 mini flushes... should prob put it in the bath really but been lazy and a bit scared of the mess I'll make lol.
    1537059734881-1503735192.jpg
    1537059705080-78756205.jpg

    2nd girl
    15370596716911314333290.jpg
    15370596285931486066574.jpg

    Overall pic of setup. Vertical light and flexi led switched off yesterday to see if it helps
    1537059591870437957187.jpg
    Last edited by Silkadin; 16-09-18 at 01:11 AM.

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  3. #2
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    what's the usual heat/humidity in that grow box though??
    is it hitting 31c every day? what's the humidity and air extraction situation?

    that leaf edge curling up starts as a heat/humidity issue usually, but it causes your girls to use up any/all potassium rather quick
    also there getting too much nitrogen still, hence the rather darkish leaves vs a nice green leaf

    your girls are looking really good overall mate just slightly outta balance feeding,




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  5. #3

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    Hmm... pics got muddled. Pics 4 and 5 are plant 1 and 2 and 3 are plant 2. Obviously pic 1 is the setup

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  7. #4

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    Temps were ranging from 22 to 29 apart from that spike at 32 for half a day.
    How would you suggest I balance the feeding? Currently it's 0.7 to 0.8ec that goes in (base ec is 0.2). Ph is usually 5.8 to 5.9 going in.

    Runoff I aim for is 1 to 1.3. Any higher and I've been putting water through on the following feed till the runoff drops back to 1ish.
    I've got a 4 inch rhino fan and filter extracting and a 4 inch black orchid now blowing in... tho the airs just from the room the tent's in for the moment till I move to the cabin next month. Before the spike it was just relying on the negative pressure from the extract fan. I turned off the vertical bulb and a little 30w led I'd added. Added another fan for circulation three clip on fans total blowing at the lights and canopy. Temps are now swinging between 23 and 27ish.

    Cheers for helping out. Any other questions let me know

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    id add more flowering nutrients P-K vs growing nutrients N,
    i know it's not what you wanna hear but the heat jumping/spiking doesn't help

    but there looking nice, i definitely couldn't do that good using cfl's

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    I've got some pk13/14... haven't used any yet... should I be? Also been adding 0.5ml per litre of canna bloom if that helps.
    I hope once I get the tent in my cabin with fresh air intake it'll cool things a bit.
    Tbh I'd love to try hps or led but I just don't have the height. Only about 6 inches left above the cfls so hoping the stretch is over... : /

    My 1st grow turned out a bit shit but the height ended up perfect. They were twiggy plants... Nothing compared to these girls

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  13. #7

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    Temps and humidity are now stable. Any idea how long it takes for the leaves to go back to normal if heat was in fact the issue?

    Thanks to CityDweller for the idea of trimming the reflectors for more circulation and light coverage. I've lifted the lights nearly to the roof... which wasn't far. I can see things getting complicated if they grow much more. Having very little experience, I'm not sure how much taller they'll get now that they're in flowering. I feel like the stretch is over but please tell me if that's just wishful thinking. Otherwise I can see this tent getting sliced up so I can try to steathily raise the lights. Becomes a nightmare to do tho as it'll change all my workshop plans I've made for the cabin it's going in.

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