Pistols turning brown at week 4 of flowering, and yellowing leaves!!!

[Greenpassion]

issues and issues. Okay so I have six photos between their fourth and 5th week of flower, and three of them have already started showing Browning pistols on top of the buds. It is not like burn I know that for sure, so do some plants Brown pistils early? I'll include some pics although I probably won't show the Browning pistols but it will show the development of the plants. And I also still need help with questions about one that has yellowing leaves which I've also included photos of. It is weak and spindly and it's gets the same everything that all the rest do and they are fine except of course for the Browning pistols. Help please! This is my first photo grow to completion. Still very much in the dark about what to do.

[Weed Pharma]

This is fairly common , especially with LED's.
Not to worry- it means your buds are growing and ripeing- about 3 more weeks of growing left. During which time you will continue to see new white pistils develop while others darken.

Some strains simply begin feeding on themselves- I had one OG Kush that always had yellowing after 1 week @ 12/12.

Your plants look like they should at week 4-5.

[Weed Pharma]

Go by the trichomes- if they have 3 more weeks , then the harvest window is about 2 weeks.

[Greenpassion]

Well they have four to five weeks more to go, and are just starting to bulk up at the very beginning of that phase. They've just begun or barely begun making actual buds.

[Toker1]

My mimosa breeder said 8-10 weeks. Ended up with ambers at 6 week. Surprise. Nice fat buds too.

[Greenpassion]

Well I sure hope mine won't be that early because they'll be awfully spindly. I did quite a bit of d foliating last week, well they were in their third week of flower. I did that after reading nebula haze's tutorial on it. Anyway they certainly don't look anywhere near fattened up. If they're actually going to be harvested soon I'm not going to get anything off of them. I'm hoping within the next four to five weeks they'll actually bulk up more.