create a chamber out of good, 1-2 inch thick wood
hang a couple of warm flouro (orange) lights above to help warm the area
now take the finished cannabis plants, scoop out about enough of the plant to stick in a garbage bag or potting plant and let fry for about a month to a month in a half
if you have trouble with plants falling over, try making a box of wood with plastic over the soil and roots. works well with hydro if you put fresh top soil in.
i havent tried it yet, im an outdoor grower so i just popped my seeds in for germination, but feel free to try.