they are only dying back due to lack of light/distance from light,
you'll see my girl showing the exact same yellowing leaves low down due to lack of light/distance
they only turn yellow because the plant is pulling the nutrients/sugars from the leaves or your feeding too much calmag
dark green leaves aren't a calmag problem it's usually due to high levels of nitrogen
its more a problem is she yellows from the top then down
wanna know if it's a photoperiod?? lower the light to 12/12 and she does it flower, also it's half electric use.
next time id try and train her a little if it's possible, if she now stretches it could double in height again.....
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