The simplest way to grow organically indoors is in 5-gallon buckets with holes drilled into the bottom. You can grow big plants that will yield at least a quarter-pound per plant without the trouble of trying to manage and water a whole bunch of smaller plants. Limits on plant amounts in states that allow medical marijuana also encourage farmers to produce fewer, bigger plants. Larger containers will work for monster plants, but the 5-gallon size has proved easiest to work with and move around, and can be found at any paint-supply or hardware store.

Fill the buckets with the prepared mix described below (or another one of your choice) and place seedlings or female clones into the top of the mix. To provide adequate lighting for plants this size, you'll need at least 400-watt high-intensity discharge (HID) lamps, either metal halide (MH) or high-pressure sodium (HPS); 600-watt or 1,000-watt lighting is ideal for bigger colas. These plants will need to grow in their vegetative state for at least a month to reach the proper size to initiate flowering and begin the budding stage of plant life. Lighting must penetrate deeply in order to fill out the buds that will grow on a bush that will reach 3 or more feet before it's finished.
Danny Danko's Magic Organic Mix
3 parts Canadian sphagnum peat mix, coco coir or pro-mix
1 part large, chunky perlite
1 part worm castings
1/2 cup greensand
1/2 cup dolomite lime
1/3 cup Peruvian seabird guano
1/4 cup Epsom salts

Mix it all together and soak it all down for at least a day or two before you plan to use it to get all the contents blended up and oxygenated. The mix should be wet throughout but not oversaturated.

The first few waterings should be done with plain water, as the fresh planting mix is fairly "hot" (nutrient-rich). Let water sit out for at least 24 hours to evaporate chlorine that will kill off your beneficial microbes. Air stones at the bottom of the bucket with an air pump will speed up this process as well.