Looks like a nutritional deficiency. That plant looks like it's been in that tiny pot for way too long and should've been transplanted into some new soil a while back. When you go into flower, these plants need more calcium, magnesium and phosphorus...which is why you see so many people with cal/mag deficiencies. Also, the more root room you give the plant, the bigger better plant you will grow. My guess is you're severely root bound and have used up absolutely every miniscule bit of nutrition in what soil is in that pot. There is also some natural defoliation that takes place as the plant reaches the end of the flower cycle when it is applying all it's energy toward fattening up and finishing the buds. Since the leaves aren't getting anything, they will yellow and die off and the plant will look more sparse. Looks like you're nearing the end of flower by the size and density of the buds in the pics, so it's either going to be one of these things. I wouldn't get too wired up about it. By the looks of it, you've done pretty well getting this far along. If anything, I would up my cal mag a bit depending on how much longer it had to go. If you're very close to pull, just let it go until you take it. Go ahead and finish it out and enjoy the fruits of your labor.
Looks almost like a zinc def. Dont quote me on it but have a look at this (every grower should have this saved and handy) and look at photos and just google what your leaves look like compar d to chart and see if you can nail down a match. You're staring at plants so this chart and your eye will be better than me guessing zinc.
Also this far into flower leaves will yellow, die and fall off which is completely natural and fine, but it usually starts w the lower older ones...so im not guessing it being this natural process. Def a nute problem and a shame you didnt repot like WW said. Good luck bro, keep us updated
Hey you guys I forgot about this post but I figured out it was just the natural process because I feed it cal-Mag every watering and also a lot of liquid bloom nutrients high in phosphorus. That plant will be ready to harvest in a few day and it's looking unbelievable!! I'm so proud of it cuz it's my first plant! Ill post pics of it if you guys want? Hurry and reply cuz you gotta see how she turned out! Thanks for the help you guys! And awesome chart man!
normal part of flowering.. big leaves die off, you have so much good looking foliage on there to finish up your run.. good work man. You'll have some tasty buds soon.
Ya I knew it was normal because I feed her a lot of nutrients and every time I water. I'm just worried that the lower buds won't be done when the big ones are...
Each flower can develop at different rates, you can harvest top colas and leave the lower flowers to continue maturing