Hi Martin95
I can see you looking after an Automatic Royal Haze.
I will Normally star using root juice as early as I see First leaves appear till end off week 2.
Then week 3 begin slowly adding 1/4 strength doses nutritions from suppliers Maximum recommended dose. Grow,Bloom and other additives you willing to use.
Use Call-Mag from week 4 onwards first feed 2.5ml per litre then every feed 1ml per litre.
Up the doseIf nutritions slightly Every week till you reach maximum 3/4 from suppliers maximum recommended dose.
Hope this information helps buddy and good luck with your grow.