Fd 21, brown hairs?

it may or may not be unusual. If the pistils are only turning color early in specific, isolated locations, then you can probably assume you are causing it. Is a fan directly pointed at those colas? Is it only the top colas in the most intense light directly under any concentration of diodes? Did you spray something on your plants? Should cover most of the bases, but i'm sure there's other things you could do to cause this, too. Your temperature range definitely won't cause this. If it is happening all over and fairly evenly, then it's just maturing faster than a typical plant. --- Call me "mean": I want to see a plant that sheds its stigmata. I've yet to ever see that occur. Do you have to sweep up mid-to-late flower? Probably caused by some sort of gimmicky foliar spray promising the world?

I agree with Legendaryseedthumb. Good luck!

There is nothing wrong with brown hairs in early age. Because she will produce 1000 more after that and they will fall of and be replaced with new once. She can even have white hairs when she’s mature 😁💪🏽 Good luck my friend 20-24 degrees is perfect. In late late flower last week before harvest give her like 18 degrees and she will explode with thricomes and maybe get purple if she has the right genetics ☺️