As an experienced home grower, I have used a variety of mediums. I find that the use of organic soil and organic fertilizers produce the highest quality cannabis. I mix my soil with about 10-15 percent worm castings and I add about a teaspoon of nitrogen rich bat or seabird guano per gallon of soil. Around about the 3rd week of growth, I feed with a light to medium tea of nitrogen rich guano. When moving to bloom cycle I switch to a 40-60 ratio of nitrogen/phosphorus fertilizer tea for the first week or two before switching to 100% phosphorus rich for the remaining of the bloom cycle.