[dyers maker]

So I just starded my second grow
Its a small 2x2x7 closet grow under a 200w hps
Strawberry Cough, Nyc Diesel, Hash Plant and Buddha

My first two seeds are 1week 1/2 old and they have already more than 4 leaf nodes

Now my question is, I understand that with the 12/12 you only use flowering nutes but when do i start using them? Do I just leave them be until they show sex or should i feed them something at this point?

Thanks for all the info SpeesCees it was very educative