Should I start flowering?

Moving this from indoor to general, hoping for an answer. this is my first grow, details can be found here

https://www.rollitup.org/indoor-growing/468318-my-first-grow.html

but here's the question, my plants are showing sex, 2/3 are anyways

Super Skunk


White Widow


and this is the third, not showing sex.

Master Kush


I've heard they shouldn't show sex until they are into flowering... so should i put them onto 12/12? I wasn't planning on starting 12/12 for 12 more days.

Well i just flowering mine at 10 inches...but you can flower at any time....the best time is 12 inches i think and it depends on how big you want them...

I also flower at 12 inches it will at least double in size, the super skunk could be up to 4/5 feet when finished. I always start to flower at 12 inches sometimes less depending on the strain

what you are seeing is pre-flowering. it can apear also befor changing the light schedual. i don't think it will harm if you wait a few more days, let get a bit stronger, nor will it harm if you change now to 12/12. its up to you.