I have been nurturing these plants for about a little more then a month but i want to know if their female. I have been putting my 4 biggest in the dark for 6 hrs a day for about 5 days but here is 3 of them. In the last picture shows the ones i stated 2 weeks ago.
i can't tell from your pictures, look at the sticky http://forum.grasscity.com/absolute-beginners/101130-sexing.html
Just so you know a plant will show sex even when kept in the veg state which is either 18/6 or 24/0. So your six hr dark period is the 18/6 veg cycle. To force a plant to show it's sex you must use a flowering light cycle like 12/12. Good luck man.