hi alex

i take it that this is your first grow then, well mate u will need to get some ferts for flower cos veg and flower ferts are completely different, im not an expert so i aint going to pretend to be.but i no u need to go to ur grow shop and get some ferts for flower and u should be using some enzymes and try getting hold of some superthrive (it works wonders). u did say weather u was growing in soil or in hydro so make shore u get the right ones for your grow.
good luck with the grow

peace