The first week of 12/12- feed it veg. (transition)
The second week (early bloom) feed it veg and bloom nutrients - reduced amounts of each. (roughly 3/4 veg amounts and 1/2 bloom amounts).
The third week and going forward no veg nutrients, but increase bloom amount.
The reason for this- the plant will grow at its greatest rate and the roots will double, too - during the 2-3 weeks of initial stretch.