Is there any chance they may have been pollinated? First thing that came to mind, or direct fan on them?
I guess that wouldn’t only effect the lowers…?
djsf
petal,
not sure, cause that plant looks super healthy and happy.
I’ve had some plants susceptible to being touched, or if they get blown around by fans and the pistils are disturbed they turn brown? maybe? just a thought…
What strain is that?
green crack. if that helps
Zero chance I have checked EVERYWHERE (drove me a little crazy). and it is every site except the top.
@PetalPowerseed How long has this been going on? I’m guessing not that long… they look like 2-3 weeks into flower?
djsf
82 - 84 degrees is on the very hot side, so you could see bananas from heat stress. Maybe pollen from a previous run? Those definitely look pollinated as that’s not natural maturation.
Well that kinda thins out the options… 
The plant is responding to something in the environment…
Only other possibilities that come to mind are relative humidity and light intensity.
Cheers
G
Are you spraying them with anything? Otherwise Sometimes hairs will turn brown if I touch them during maintenance or watering.
Neem 2 weeks ago have not since flower
for these led is is recommended to run warm. other plants have been fine. Again zero chance of pollen in the tent I can find but I guess we will see.
like a few days. I noticed the top and went to look the sides and I have been stumped.
Have you scoped them?
I read somewhere Green Crack has Skunk #1 on it, and early brown pistils are common in that strain. I suppose when you sprayed with neem oil there were no pistils at all, because it is well known it burns them, hope it won’t affect your harvest at all … 
nope I sprayed once as a preventative on flip day. should have been fine.
Yes and yes. 
Critical, another Skunk 1 variety, does the same. The soft fine white pistols that go brown if touched, by anything near as I can tell.
Cheer
G
Update everyone. So I read through this for ideas. First I got my temps down a bit. and uped my ventilation. Its loud as all heck but oh well. The brown ones are not all the way brown now just the tips and she is slowly throwing more. I think it is a combo of genetic predisposition to sensative pistles and a heat issue. I will include pic next update. I forgot this time.
I’ve seen feeding with an abundance of nitrogen in flower cause the pistils to turn brown overnight
Sounds like you got a handle on it tho
