as you have'nt fed them at all i would give them a 1/2 stength veg fert when you put them into flower,they'll need it for the growth spert they are gonna have,then change over to bloom fert.i have great result's this way,i use npk 0/13/14 for one week only at least 3 week's away from harvest or after you've flushed you'll still taste it!!can't remember what npk my bloom is but will find out ...spliffbuilder.