select them 3-4 weeks before you harvest,after the roots form,give them the GH mixture for seedlings and clones,after the 2nd week give them the preflowering application,keeping them on 24hrs of fluorecent lighting until your first crop is harvested,then move them in to your system and start the 12hr light cycle,cuttings are fully matured plants when the roots develop,there is virtually no veg period involved(thats the advantage of cuttings),try to fit more cuttings in the system 12-16 plants,this is possible because the plants and roots are more compact than a seed grow,in about 8wks they should be ready enough for harvesting....bonbon