I have read something on cloning early then puting the clone in a place with way less light and flowering it to see if the plant is male or female. Anyone every tried this outdoors?
Well it is the same principle as covering a branch with opaque material for a specific photoperiod (12 on 12 off) It is easier to accomplish inside but you could just have a clone and put it under a bucket or overturned pot outdoors if you really want to use this method. Or you could just look for preflowers about 3 weeks before flowering to determine if it is a male or female.
It would be the same. Just use the same light you use to clone. Once its Fully Rooted cut the light back to only 8 hrs. and keep it dark for 16 hours. If thats not an option: However your cloning, just do the same thing. I dont know if you use the sun or what, but just keep it in the sun from sunrise to like 2:00 or 3:00pm then move it to someplace dark. After a week or two most Indica's will pre-flower. Sativa's can take a bit longer. Good Luck.