How big do you want them ? Depending on the strain they will get about 3 feet if you start to flower in a week. Do you want trees ? I use the lucas formula. Lite at first about 400 to 500 and then pump it up to a 1000 ppm's when they can stand it. That's not counting additives, like budblood the first week of flower and then bigbud in the middle and overdrive just before flush week at the end. latewood has some new formula's that sound great I would like to try. do a search for him. Post a few pic's if you can, we like to see.