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Home Forums Grow Community – Ask Questions & Share Your Grow! Possible Potassium Toxicity in early Veg (day 25).

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  • #1471

    Hello Chris and friends!!

    I’m on my second grow and I feel like I’m noticing a Potassium Toxicity – though I’m not sure. I would appreciate any guidance you can provide.

    Here are the deets:

    Day 25 

    Darker Color with interveinal chlorosis?Strain: Blackberry Kush

    Medium: Soil (Roots Organics Original)

    Amendments: Earth Dust Nutrients (Base) and Worm Castings

    Watering with RO water + Cal Mag and just started Drops of Balance.

    Space: 4×4 grow tent with MarsHydro TSW 2000 (just raised it to 50% at 24in above plant).


    My question: I feel like the leaves seem a darker shade of green than what I remember from my first grow and there is definitely a bit of interveinal discoloration happening.

    Lower leaves twisting. They have remained that way.


    A few weeks ago, I noticed that some of the leaves were twisted and edges of the leaves were turning up (making it even more serrated) and I assumed the temperature was too high.

    However, I’ve been consistently between 75 – 82 degrees F and 66 % humidity. I’ve also made sure to keep the light 24in away as the plant grows.






    About a week later, I noticed one of the NEW leafAffected new growwas growing slightly deformed (curling on one side) and with a copper discoloration to it. It has continued to grow despite the discoloration, though. I started to supplement Cal/Mag (5ml per gallon) and also bought some Drops of Balance and added it to my last watering (3 days ago). I’m now starting to notice some small yellow/copper spots in the lower and middle leaves. Could this be a potassium toxicity showing up as several deficiencies?








    Sorry I missed this. Did you get it rectified?


    How much fertilizer did you use and when did you apply it? By just looking at it, I suspect magnesium deficiency:

    Magnesium Deficiency in Cannabis Plants


    Inter veinal chlorosis. green veins light inner area. mag def

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