start with 33% nutes to acclimate plants then go to your nute schedule...I don't remember whether you are soil/hydro, but once they are rooted and have 4-5 nodes I would say..nute them, but, what nutes do you have...I use AN and they seem to be stronger than others...I went my whole grow last time with a 50% solution throughout hydro grow...
hope this helps.later