Discoloration leaves while in flower

Just one more thing. If there's nothing wrong with Ph of that pot you're probably right on the Nitrogen deficiency. That would be a normal deficiency to happen at this point. When we flush a plant at the end of it's cycle that happens to because we wash the soil and there's not much to eat but even during flush the plant can gain weight. Keep doing that good work ;)

Just like fruit tree in the fall this is the plant burning off chlorophyll this is good

That’s the plant using up everything she has trying to make seeds happen before she dies

I agree with Roberts on this one.

You are actually experiencing a potassium deficiency and the plant has been absorbing the leaves. Potassium deficiency first sign is straight burnt tips. Discoloration, and spotting follow soon after. I would not give it any nitrogen. Plant wants very little to none in the stage your in. Potassium, and phosphorus is the key. Too much nutrition the tips would burn, and curl up and in. 3 years of growing cannabis I have seen many confuse potassium deficiency for nute burn.

+ I saw many leaves with yellow ends, this means you have been overfeeding a little bit. Next time when you start seeing yellow tips, reduce your nutrients with like 10% and you will be fine. It is also always a good idea to give only water with like some enzymen, they love it and your medium(soil) will have a better balance.

It can be a overfeeding problem. When i took a look at your diary i didn't saw that u use many nutrients so it might not be te case. Did you gave them only water often? so your EC will be at a good range? What you can do is flush them a little bit and see how high in EC your run-off is. Also make sure your run-off is also arround ph 6.4-6.5 When your PH/EC level is to high/low you can get deficiencies or shutdowns because you gave to many nutrients. Also, in later stages of flowering, plants like to absorb nutrients from the leaves to the buds, its a normal process. Only when you feed perfectly and untill the end, leaves will stay green. Most of the growers don't like to do that and don't mind leaves getting less color in the last stage of flowering. I think you will be fine, but still you should check your runoff water. Goodluck.