Environmental factors start influencing sex the moment the seedling has three pairs of true leaves (not counting cotyledon). Environmental factors that influence sex determination of cannabis include but are not limited to:
Increasing the level of nitrogen makes more female plants. Lower the nitrogen level to create more male plants. Increase the level of potassium to increase male tendencies; lowering the potassium level encourages female plants. A higher nitrogen level and a lower potassium level for the first two weeks increases females.
Low temperatures increase the number of female plants. Warm temperatures make more male plants.
High humidity increases the number of female plants. Low humidity increases male plants.
Low growing-medium moisture increases males.
More blue light increases the number of female plants. More red light increases male tendencies.
Fewer hours of daylight (e.g. 14 hours) increases the number of females. Longer days (e.g. 18 hours) make
more male plants. Stress: any environmental stress tends to yield more male plants when growing from seed.
Right about now, you may get lucky. I was reading on here that colder temp. cause more females. I have had 7 out of 8 females this winter...rw
