how big

hi there
this is my first grow and i was just wonderin how big should i let my plants grow i have 4 babys in autopots in a growroom 2m by 2m and the hight would be 2.5m high the pots are on the ground and the tank is outsde the tent im running a 600watt light.any answer would be greatful thks

u mean how big should u let them get before flowering? id say about a foot to a foot and a half. you have to consider the plant will grow twice in height during flowering.