Yellow leafs purple stem (not genetics)

It’s ether N deficiency which is a lack of nitrogen which can easily be fixed with just adding some nitrogen to your fertilizer a lot of people make this mistake during the flower stage I know your plant needs a lot of magnesium and phosphorus during the stage but it also needs nitrogen just not as much as veg My second diagnosis would be S deficiency S deficiency is sulfur you can treat S deficiency by lowering your pH to 5.5 to 6 add in organic sulfur to a fertilizer That contains magnesium sulfate Epsom salt is a great source of magnesium sulfate have used Epsom salt to fix my plants in the past it works great hope this helps

Hey there Fungi, i gotta disagree with Mota on this one : this is K deficiency, you can tell from the colorful splotches on the leafs as well as the purple stems. When plants flower, they just need more K, so they start cannabalising themselves. Try to find some K somewhere, maybe a banana peel based fertiliser ? Hope this helps ! 🚀

Hey buddy! This looks more like a nitrogen deficiency; when it's phosphorus, they get more brown spots. I recommend adding a bit more nitrogen in nutrients because if not, it will keep turning yellow quickly. The info doesn't say what your pH is, but in flowering it should be around 6.2; that helps absorb the necessary nutrients at that stage. Everything above looks good, to be honest. Good luck! Happy growing!