Separate them as you go. Get a magnifying glass and watch where the branches come out of the main stem. It will show its sex there. Look on the web site (growweedeasy.com) and you will see two images under the heading of SEX. One is of male and the other is female. After you see a MALE you will know from then on without a mag glass. It wont take long. Alot of the individuals here have been doing this for 20 and 30 years. Patience and correct knowledge is the key. Some info out there is bogus, be careful and don't hurt your girls. When you do something to th plants give it time to react before you try something else. If you have a question that is in needs attention, Nebula Haze would be the person to ask. Shes very forth coming with correct information. Dirty