sexing outdoor

besides germinating inside the rest of the growing process has been outdoor. theyve been growing in pots and have pretty good direct sunlight a good bit of the day (atleast 8 hours) i was wondering how long it should take for me to be able to determine the sex of my plants (i got 6 that are close to a month old and im germinating another 6 that im gonna start inside)

around the beginning of flowering i BELIEVE .. u should be able to tell when they start growing balls or fingers