fox farm soil question?

hi i'm using fox farm ocean forest soil.my question is if i do my last transplant at the start of flowering,how long do i wait before i need to start feeding?i'm going from 1 gallon pots to 3 gallon and theirs going to be alot of fresh soil in there.just wondering how many weeks do i wait before feeding?we all know ocean forest is pretty rich with food and i don't want to over feed.

anybody?

i think it should be fine to start whenever you plan on watering them. Just start at 1/4 strenght dose