Autos grow like a pre-programmed photoperiod. They fuse the vegetative stage and bloom. When they first begin to bloom, you have to still meet the nutrient needs of vegetative growth. This is the stage where they will really put on the size. I always keep on the grow nutrients, until we are fully out of the stretch. The way I balance this is, I add bloom booster from the formation of the very first pistol on. Then it is building all the bud node sites you need for it to swell into spears.