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Thread: Cannabis leaves problem

  1. #1

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    Default Cannabis leaves problem

    Hey guys,
    New here but used the site forum for information so far and looking for a little help as have searched but what’s been suggested I have already done.

    I have 4x big bud x white widow and 1x Red dragon by barneys farm currently 4 weeks veg and the serrated edges of the leaves are curling up.

    Going to kind of say the whole set up as I’m stumped now, In the groom it’s 25c and 55% RH controlled by an ecotechnics fan controller, 600w hps in cooltube with reflector and oscillating fan blowing over plants, 8” exhaust and 6” intake, the plants are in 11L smart pots in plant magic soil using the plant magic range (grow, bloom, bio-silicone and magne-cal) have only just started using the nutes at a 1/4 strength, using the bio-silicone at 0.5ml and used the magne-cal (3ml) as a foliar feed once in veg at 3 weeks and will use again in flower about 2 weeks in, I water every 4 days roughly or when the top inch of the soil dry/light to pick up.

    If I’ve missed anything you need to know let me know, thanks in advance.





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    Last edited by Matty90; 17-10-18 at 09:05 PM.

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  3. #2
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    with the hps i can't see exactly what's wrong,
    slight leaf curling is probably wind burn, i point my fan at a wall not directly at the plants

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    Quote Originally Posted by MonsterEnergy View Post
    with the hps i can't see exactly what's wrong,
    slight leaf curling is probably wind burn, i point my fan at a wall not directly at the plants
    Sorry the photo didn’t come out as good as I thought it would here’s another




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    Quote Originally Posted by AND View Post
    Heat stress mate, what temps do you have at canopy level ?
    25-26c I have the fan controller probe at canopy level and other hydro meters in with a memory log and it doesn’t rise more than this


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    Quote Originally Posted by Matty90 View Post
    25-26c I have the fan controller probe at canopy level and other hydro meters in with a memory log and it doesn’t rise more than this


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    Very odd. Looks like heat stress. Your temps say otherwise.

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    Quote Originally Posted by CityDweller View Post
    Very odd. Looks like heat stress. Your temps say otherwise.
    I thought exactly the same so yesterday bought a 4th hydro meter as the others I’ve had for some time but turns out was still reading correct


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    Quote Originally Posted by Matty90 View Post
    25-26c I have the fan controller probe at canopy level and other hydro meters in with a memory log and it doesn’t rise more than this


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    Is your fan blowing near the probe/sensors and effecting correct read maybe ?

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    Quote Originally Posted by AND View Post
    Is your fan blowing near the probe/sensors and effecting correct read maybe ?
    It’s I’d say about a meter and half away on the lowest setting so wouldn’t have thought it would be affected that much but il definitely try positioning the fan static at a wall rather than oscillating around the whole room, thanks for the advice


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  19. #10

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    Maybe you should buy 2 more hygrometers since you only have 4. AND helped me with this when it happened to my plants and I did some research.

    Leaves curling up are trying to protect themselves from too much light. Yours are older than mine were. There's an intricate balance between light, heat, humidity and nutrients.

    http://www.just4growers.com/media/23631/vpd_2degree.gif

    That's my ultimate guide to try to be in balance. If you dont have the correct humidity x temp your plants aren't going to be exchanging nutrients as well. This will slow down the growth and decrease the photosynthesis. Thus decreasing the light demand.

    So use the chart and regulate humidity x temp. Cannabis can be really fiddly and different strains react differently.

    Leaves curling up like that won't reverse itself when you correct, but the new growth will be normal.

    Finally, this is merely a symptom of a not very dangerous condition.
    Quote Originally Posted by Matty90 View Post
    I thought exactly the same so yesterday bought a 4th hydro meter as the others I’ve had for some time but turns out was still reading correct


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