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Thread: cupping leaves

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    Default cupping leaves

    Hi all can anybody tell me what causes this to happen to leaves, I can't find a reference to it anywhere.
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    thanks in anticipation
    So much to learn, so little time to learn it

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    Quote Originally Posted by Le chef View Post
    Hi all can anybody tell me what causes this to happen to leaves, I can't find a reference to it anywhere.
    Click image for larger version. 

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    thanks in anticipation
    Look like heat stress
    Try to bring the light lil up from the plants and add a fan for better air circulation!!

    What's the temp in your grow room o tent? And humidity??

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    heat normally causes it

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    Temps 83.5f h 71.5low RH 56% - 45% Using 150w LED board 800x800x1600 tent light about 18" 8 weeks of growth 4 weeks of bloom. Ill have to pick up on this in the morning Thanks

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    are these under led? they do look like it

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    just seen the temp and yes led , your temp needs to be 28c to 29c which can swing up to 30c with a controller which does causes the heat stress (some strains get it more than others) get some plain mg in to them, extra in each feed it will stop those pale leaves u have coming, you may have a hot spot there test it i dont worry to much with a little heatstress

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    Thanks for the advice Forest, both plants are GSC one dark one light they've been like it from day one. I'll treat the affected plant with mg on next feed,what level should i give?

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