Why would the oldest, strongest, most heatproof leaves towards the bottom of the plant randomly be turning away from light?
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These 2 leaves rotated 180° on a 2 day cycle. It has nothing to do with too much heat or light.
I do deficiency trials/photography for expensive literature that helps feed 5 billion people who don't have time to get high and bullshit on the internet. Let me show you something...
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Same plant, a week earlier. Notice the top leaves? That might be a clue what's causing the twisting petioles down low. Nitrogen tox right? Read my post history. Only reason I signed up. Nowhere else is Calcium deficiency mistaken for nitrogen toxicity. All Youtuber grow bros, pot casters, etc all have the same exact problem in their gardens and refuse to see it, because they are all poser sheep who don't even know the definition of photosynthesis.
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Now here's a plant with too much light, coupled with sodium stress to exaggerate the effect. Same plant in fact. Chloroplasts leave the picture when light is too intense. See attached youtube vid. They don't lean away.
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So why is one top fan leaning? Fast growing Cannabis + vertical petioles + weight distribution + gravity. I tried to flatten it, now it leans to one side or the other.
The same thing is happening in an automated fashion lower on the plant as the calcium is attempting to mobilize from the oldest leaves and gravity pulls on the soluble nutrient. That's all that's going on here. You ignored multiple calcium deficiency symptoms and focused on a relatively novel one, thanks to the severely detrimental perseverance of trickle down bro baloney on weed forums.