you vegg 24/0 18/6 every day untill you start to flower, then you have to have 12 houre lite and 12/hours compleat darkness, unless growing outside,but its not the rite time of year to be growing outside yet.
i vegg for 4 to 6 weeks and keep the lite on 24/0 all the time, this makes the plant grow.
then when you switch to 12/12 thats when you start telling the plant to flower.
and after you have been doing 12/12 for 2 to 3 weeks, then you will able to tell sex,
you must go to 12/12 b4 you start growing buds, or to tell sex,.
it isnt how big before you can tell the sex.
btw. you must flower the plants for 6 to 10 weeks depending on strain.
havent you even read up on the basics.lol
faq read up.maybe the basics,maybe before you stert to grow.it help to know what your doing.
any pics of your plants.