wondering what this problem could be

[KidGrower]

I have two plants planted in the ground outside they have been outside since march and recently one plants has started yellowing at the top and turing purple with some black tips, i noticed this more after i bent the branches down so they wouldnt get over the fence. Ive been feeding them a bunch of diffrent nutrients at different waters so its hard to say if it is an excess or not because the other plant is healthy and fine. I think it could be a fungal or bacteria related problem becuase for the past week i havent fed them any nutrients only some recharge, fulvic amino , humic acids, coconut powder. I foliar fed them a couple nights ago with some btk to help with caterpillars and some Mono potassium phosphate at 0.5 grams per gallon.

 

[Gmix]

Purple can be from genetics or cold however it can also be a lack of p

I don’t think you have a fungal infection

It does look hungry

 

[Hossgrows]

Welcome to the enders club.
Lots of us going thru this right now, being were just a few weeks from finish. The plant is eating the reserves from the older leaves.

Here's mine.

 

[JIMKSI64]

All those fans can power that plant for 3 weeks. No one smokes fan leafs.
Now if you are a month out and the sugars are fading we can add some food.