When sex organs appear?

14 days is very normal..

It really depends on how old the plant is when you start 12/12... if the plant already has alternating nodes when it is switched to 12/12 it will show its sex sooner..

and NOW you KNOWM
 
From pure observation i have 2 sativa and 2 indica plants. cant say they are full but two of them are tall and less bushy and the other two are shorter and their branches are mcuh more superior and make very nice clones. anyway my 2 sativas showed 1 week both females.. waiting on the bushy ones.
 
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