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One of the LSD plants has some rust spots appearin...
Athosanswered grow question 6 years ago
Your pH is spot on for coco, your lights on temperature is a little low, but that will only cause slow growth, not spots, but try to up it to 24°C (75°F).
What you have there is excess P and or K, that in turn locks out other minor elements. Your feeding is too strong, dial it back to 1.0 EC (500 PPM) and only up it if you see deficiencies, when you put it to flower then up it slowly to 1.4 - 1.8 EC (700 to 900 PPM). Remember regarding feedings, less is more.
Experimentgreenanswered grow question 6 years ago
Hey there so I'm having a similar problem with one of my plants. A leaf that is rusty spotting etc. I believe my problem is due to the plant beginning to outgrow the container and overwatering(poor drainage, circulation). Therefore causing unfortunate root troubles and nute uptake problems. although giving your basic nutes should provide the necessary items, if they're locked out it'll make no difference until remedied. All of your information looks pretty good, so if you attempt the cal mag and it doesn't fix it, try looking into these other potential issues. Happy growing :)
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Stickanswered grow question 6 years ago
Hello there! What I see is necrotic brown spots between your leaves veins. It looks like a boron deficiency. Does her upper leaves display abnormal/slow growth? Are the stems becoming rough/hollow? Do you use RO water to feed her? Has your plant been underwatered for a few hours? How stable are your grow room conditions? I'll be around, good luck with these babies!
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