Quote Originally Posted by Perp
You can keep your lights on 12/12 straight through from seed. It will flower as soon as it reaches maturity.

Also, it has been my experience that the following regimen promotes a higher percentage of females. I regularly get 70-80% females using these methods. I should point out that I use soil and soil-less mix. Don't know how it would fare in a hydro setup.

1. 12/12 light cycles in early seedling stage. I will switch t0 18/6 when the plant begins to show it second set of real leaves. You can leave it on 12/12 if your space is restricted.
2. Cooler than normal air temperatures: about 62-68 degrees
3. Use cold water. I draw from my cold water tap and use it immediately. I know personally an old timer that refrigerates his water before use.

It is my opinion that these three conditions more closely mimic the weather and light conditions of early spring, so as to not be detrimental to the seedlings in any way. Why the result is a higher ratio of females, I don't know.

As for your question about the medium. I would not use it and invest in a bag of Promix or a good potting soil. I would also buy some proper nutrients. If you spend any money at all, spend it on these items. Your buds will be so much better. Good luck! :jointsmile:
Pure luck, probably. If I'm not mistaken, male/female is already programmed into the seeds genetic makeup.