Look at what is in the soil you're purchasing, if you need a LOT of soil you can use generic potting soil and add your own organic base such as guano, worm castings etc.

This year I took all the old soil I used in the spring, put it in a fire pit and burned it to sterilize the soil, I then mixed it in with new soil and added worm castings and a manure based compost.
Purple Daddy Reviewed by Purple Daddy on . First indoor closet grow/ questions / 18 plants! Lets hope for a turnout Yall can look back through my posts I started an attic grow once which got devastated due to an abnormally hot day. Since then i've moved out, got my own place and started another grow! It's climate controlled. In a large L shaped close in the bottom of the L. I have a total of 8 23 watt CFL's and 2 larger fls( I think around 34 watts). RIght now they are planted in Miracle Grow seed starter, and doing wonderfully. I will be transplanting all of the plants into larger pots today. They are Rating: 5