They are gitting big so fast now and i was just wanting to know when to start them on the bloom nutes, keep in mind that in the first 2 weeks i had some plants die on me and being the noobie I am I just thought I would start more to take their place, so there is 3 plants that are 7-10 days younger. I'm not sure what to do here?? (none are starting to bloom yet so i dont know whats male or female)