I’m not sure. I’d be guessing to say potassium or Phosphorus Can you post a pic of the whole plant? That looks like old growth? What week of flower is she? Hopefully someone more sure that you’ve tagged can take a look.
Another thing that’s important to know, have you taken any runoff ph readings.
I thought that but couldn’t back it up with anything other than the chart.
I’m with @GreenJewels line of thought, what week flower are you in? What have you been feeding?
Is it growing, or has it stopped?
Looks like natural coloring, I’ve had a few in plants that just turned on their own, and always that hue.
Lower temps at night? 60’s?
The entire plant looks great.
Bulldognuts-
I have always read that you dont water organic living soil to runoff. I did a slurry 2 days or so ago and the pH was 6.21, and for the halibut, the ppms were around 600. This is really looking like a phosphorous issue to me. I am going to water in some bone meal (npk 0-10-0) to see if that might help. I had asked for good sources of potassium, and there was not much response, that I can remember. I have some banana peels but don’t k n ow if its ok to cut some small pieces to put in there for the worms to eat and hopefully give to the plant. Just waiting to hear if thats ok to do. The chart davyg sent above points at phosphorous being the problem. But sometimes these charts are a little confusing. I have one chart where they used the same picture to describe two different problems. Green jewels is right- the leaves that are effected are lower leaves. On most of these types of problems they start at the lower end and work their way up the plant. I am gonna give her some phosphorous and wait to hear on potassium sources I can give. Thank you all for your input!!٪
Covertgrower-
Like the rest of the country, its starting to get cold. She gets down to 68-69° at night. She is a blueberry, and I dont recall their foliage getting purple like grandaddy purple and those of the type strain. I did a very slight top dressing with bone meal (npk= 0-10-0), and will get a batch of molasses tea ready for her next watering/feeding. Thank you sir for responding! Peace…
Elightened-
I had to scroll back to find the day she kinda started, and that was 19 days ago. No real development of the buds for really almost 2 weeks.
I am just at a loss besides it probably has a phosphorous deficiency, which I treated her for tonight with a sprinkling of bone meal (NPK=0-10-0) and spritzed it in tonight. Was waiting to hear some sources for potassium to have ready. It just puzzles me because she doesn’t look in that bad of shape. She is crazy different from the last one I grew. Same seeds, same shipment. The one with terrible light and questionable soil was well over a foot taller with a lot more bud sites. There is a picture of the 1st plant in post 214. And the 1st plant was in a 2 gallon pot. Just looking at what she is trying to tell me. I know somethings off, just don’t know what it is. Whatever it is has been going on for a while. Thanks for your input, I appreciate it. Peace…
Davyg-
That top chart is very good! Where did you get it? I have the chart on the bottom. I think you have played a big part in diagnosing the problem. I want to thank ALL of you for your input. According to davyg’s 1st chart. I am seeing phosphorous deficiency, late stage. So let’s see if we can get Betty back on track. Peace…
Hey Patchy, don’t know if you’ve moved on yet but can’t you give them small amounts of wood ash for potassium? Or like you said, banana peels should work, right?
Or I think I read somewhere a while ago that coffee grounds provide K too.
I’m sure whatever it is she will be fine in your care. Keep on keeping on, my friend! x
Hello @patchman I got that chart from uk420 website. I have the link but will break forum rules if I post it. I thought I could email it to you but don’t know how to do that.
Yes sir, I use hot soil and try not to water to runoff also. I do occasionally to check ph, but slurry is the best way to check 
Not sure if you are familiar with budbrothers journal he’s definitely the go to person for everything organic. Here’s a link to his journal if you aren’t already familiar with his work.
Hey CJ-
THANKS for your input. If my memory was better I would remember that about wood ashes. Well I would say we are moving in the right direction. Did my morning check and mist and Betty appears to be perked up a little to me. I am going to make some molasses tea to give her later today. Here’s a pic. The leaves around the top cola seem to be more at attention.
I will keep trying to get her back to where she needs to be. Thanks again CJ, and bulldognuts, enlightened420, davyg, green jewels, and Cody for giving me a like!!Peace…
Oh yeah she’s looking perkier! 
Nice work, I knew you’d do it.
I get by with a little help from my friends…
peace friend…
Lookin great @patchman!
So, @patchman. I was having a look around for tips on organic gardening, went down a rabbit hole and came across this guy. How I make soil bacteria for my veggie garden - part two - YouTube . He has a series of videos going about making his own brews etc for his garden. He details what he has done and the mistakes he has made. He also explains how and why things are done. Definitely worth a look. He makes tea about 10 minutes in 
Thanks Davyg!
I think she is trying to turn the corner. I will give her some more bone meal next week. Gave the microbes a molasses tea last night. I am sure that will give them a little boost. Davy I dont know if this has crossed your mind or not, but it seems to me that the mistakes I have made so far have been when I tried to feed the plant. It seems to me so far that all your feeding is or should be going towards the soil. Then the microbes take care of the plants. Anyway, we are treading water over here. I am trying to see what she is saying to me. Aint no give up in this stubborn mule, lol. Peace Davyg…
Hey @patchman, I think you’re spot on, feed the soil although I’m trying a foliar feed just now as I have severe calmag issues. I’m also feeding the soil. I’m finding that growing under leds is a completely different thing to growing under HiD. I watched the video this morning that I sent you and he explained the reasoning behind the choice of molasses. So if I cant get the right one then it’s going to be brown sugar. I read a post on here about the brown sugar thing but didn’t really get the “why”. I’m following your post and learning from it so keep up the good work 