When you said rare beans it triggered a memory from growing a domesticated landrace from the border region, that was essentially a grape flavored, purple alien tech Afghani. It was severily N sensitive. Stunted it’s growth in excess and made the plant crazy Bushy. It was a light feeder all around and needed dry feet. One pheno would tank out all together if I top watered it, just droop until the top inch or two dried out. Subirrigation with N below 150 ppm or a mild super soil subbed be
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i would look for bugs . Leaf edges appear light might be pic . Or N tox , could be soaking wet pot too
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Some plants from my orange line have a disdain for nitrogen and will look just like this if I feed them standard bottled nutes.
Problem is I never know which ones until they freak a little lol
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I’m guessing too much nitrogen at flowering, what was the food given? Try fertilome chelated iron. It can unlock nute pollution and balance out the green.
Soil should be dry in 3 days. If it’s not then there’s the main issue when trying to fix the plants sudden change.
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Thanks for all the help guys, hoping this gets rectified soon. To clarify this isn’t My plant it’s a good friends but this one’s crazy. Hopefully she gets fixed up thanks to all of your help. I’ll keep you all posted
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It’s never your plant nod nod wink wink 
Lol 
Paps
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Needs phosphorus and trace minerals. Adding calmag will make N excess worse. As it’s primarily a low P problem. N makes sugars P moves them. Excess nitrogen is never a problem with cannabis until amino acid levels are so high that Ca uptake is blocked, Calphos deficiency having the distinct ringed spots. Phosphorus deficiency is what make cotyledons fall off. A proper phos level will keep cotyledons on the plant through its entire life cycle. Cannabis with proper phosphorus levels will never drop a single leaf.
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@HamTheMeatMan
Thanks for that post, I found it very insightful. 
BTW
I am not easily impressed, but consider me impressed.
I see you are kinda new here, I hope you stick around.
If you have the time, I would love to hear your comments on a few threads I started.
When you have the time of course. 
Here are the links.
Very much appreciated @HamTheMeatMan thank you
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Just knock away… 
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I’d also say it looks like overwatering. Maybe also VPD way out of balance. But let that root zone dry WAY out of a week or two. I will probably recover. I had one strain a while back that HATED being watered and would do that after every watering
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I wish plants could talk, then they could tell me when to back off when I’m coming in with too much water lol
Sometimes plants drink less and sometimes plants drink more, or in rare cases, your plant is just an asshole and it doesn’t want you to succeed.
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Bahaha @Cormoran thats gold!
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“Maybe your plant is just an asshole”
Knew it, suspicion confirmed. 
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Met many of those over the last 20 years!
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Very true indeed!
@SHSC-1 uses a weigh the pot dry and wet to determine when to water.
You could shortcut this by lifting them up once you are familiar with this method, but weighing the pots is more accurate.
Good luck!
Shag