Flowering

These are all good answers. One more input for deliberation. Take your maximum light mounting height, minus the manufacturers recommended distance from canopy, then allow for your plant to stretch 100-150%, then you can get your max plant height in veg. Basically, when your plant's flower stretch is done, ideally it will be around the rec. canopy distance from your bloom lighting. < - - This where math and a little lucky guess (strain stretch) work comes in.

I normally have a rule of thumb of 1/3 height to the light. Top her a few more times.

Hey there lad! As Jack Herer said, you may put it into flower at any Time. Still as he suggested, i would wait ~ 2 month in veg before switching the light to 12/12h. Keep in mind that the plant will double in size once the flowering stretch is done. I would also recomand a little pruning 1 week before putting into flower. So the plant may focus its energie to fewer bud sites but those may become colas instead of many popcorn-buds. Oh and... If it's an outdoor grow... Let mother nature do the switching (in august) Hope i was helpful! Happy Growing!

Hi YoungSmoke, you can turn yoru plants to flower at any time you wish, only have to switch to a 12h/12h schedule. In my case i wait about 8 weeks until i flip them into flowering. This allows for the plant to have a decent period of vegetative phase - root development, plant structure.