For PH and Drainage of the soil, I use 60% Potting Soil(sterilized), 15% Perlite, 10% Builder's Sand(no playground sand/beach sand; salt content), 10% Worm Castings and I usually use 5% more Potting Soil, but then you could substitute the 5% for your own desire/plant needs. I use this soil mix from seedling to flower:hippy:
M.B.A. Reviewed by M.B.A. on . what soil to use? I did my first grow last summer and I screwed up. I used "miracle grow" soil with slow release plant food already in it, from germination all the way through. The fertilizer killed many of the early seedlings, and of the plants that did make it to flowering all were male. So I want to start my seeds in "regular" soil now. The problem is, I don't know what to buy. The hardware store near me has "organic" potting soil, but it sounds like it may have fertilizer in it too, just the "organic" Rating: 5