Auto flowers and super soil

I would not give them anything until the first leaf goes yellow. It may never go yellow. Save your supersoil from salty nutrients until you are convinced they need it by them showing you. Don't be suckered into giving them things to make them bigger faster. Good soil is good for 28 days for sure. Be sure you have adequate calcium that they can take up.

 

Yes, not exactly, but they wont need anything, no premeptive strike necessary if it has enough calcium in it. You'll see, don't be fooled, those autos will be beautiful on water only for the first 28 days of their life in soil.