I agree to SpinnerCarribean, if you want to grow successful, good genetics and a good soilmx is the basic. To sve here is the wrong end.You can use a premixed light fertilised soil ( biobizz, Plagron) or you mix your own supersoil. Weed likes it fluffy and stable in PH. So if you buy a premix or do your ownmix, you are on the right side. In the comments i write an easy and very stable mix you can use for the sensitivest plants. greetings