not required to feed during veg.. the roots organic soil carries them thru..
they start in the ez cloner.. after roots pop, they go into a plastic red cup from costco. after a week or 2 they go into a 6inch mesh pot.. after another couple of weeks they go into a 3gal pot.. each time i just transplant into plain roots organic soil. i do however sprinkle layers of mycorrhizal granules each time i transplant. usually 2-3 layers thru the soil. so since the next pot size is bigger than the previous, the new soil u are adding is enough to feed it for a few weeks with just water only.
then right before i transplant from 3gal pot to the 7gal flowering pot, i fill it 2/3 of the way with super soil.. put a layer of xtreme mycorrhizal granules, and put the plant (which is in the 3gal pot) on top of that.. and fill the little bit of space on the side with just plain roots organic soil.
you can do water only during flower if you want, but i found better results using the liquid karma, sucanat and hygrozyme all through flower.. no flush, nothing.. just dose em once a week with the additives, and chop when ready.. no need to stop with the additives it does not leave any residual and does not negatively affect the flavor.