I have been using GH in soil my last grow.Rhizome say it, use 1/2 dosage per gal.I feed once a week and water 3 times before feeling again.The soil you use makes a big diffidence too.Dont use any soil with time release fertilizer in it,and add more peralite to the soil too.When flowering started I would let the soil dry out one exta day before I fead them.then water after they dry out.I only got up to raising the nutrs to about 3/4 to 7/8's of whats on the lable before they finished.I flush them three times,Once in the middle of veg,once two weeks into flowering,and at the end of flowering.It worked for me. PEACE