[cantharis]

Newbies still get confused on this point, so a thread to clarify matters might help. As we are all aware, cannabis responds to the number of hours of daylight per day to determine how it reacts.
Indoor growers give their plant an 18/6 regime (18 hrs daylight, 6 darkness) to induce vegetative growth, then when their plants are large enough they revert to a 12/12 regime to induce flowering. This causes a certain amount of confusion with outdoor growers.
As the days are getting longer, your ladies growing outdoors will be in vegetative growth. Once the solstice (21 June) is past and the days start getting significantly shorter, the girls begin to flower. I find this happens about the middle to end of July.
They DO NOT wait until natural 12/12 arrives before they start to flower - this is merely a convenient lighting ratio used by indoor growers. Natural 12/12 actually occurs at the autumnal equinox, on 21 September (same everywhere in the world) and they will be well into flowering, getting to harvesting, by that time.