One of the richest sources of ready nutrition for your cannabis plants are from worm castings...worm poop, and buying worm castings can be expensive. Not only am I frugal, but I am an environmentally friendly sort of fellow and I believe everything we do not use should be recycled or returned to the earth for re-use. Hence, a few years ago, I discovered the many benefits of "vermicomposting". (Vermi is Latin for worms.) It's easy to start a worm bin, all I did was use a 31 gallon plastic Rubbermaid Roughneck storage bin. I drilled about thirty 1/4" holes at the bottom for drainage, and lots of 1/16" holes around the top sides for air exchange. Before I loaded the bedding, I covered the bottom drainage holes with screen mesh so the worms can't get out and loaded about about 10 inches of dried leaves and shredded newspaper on top for bedding. Then in went the composting worms. I then use another piece of screen mesh between the lid and the container, this keeps fruit flies out. Also on top there is a jar with a little apple cider vinegar to attact and drown fruit flies and it is very effective, there are no fruit flies buzzing around anywhere, they are all drowned in the trap. The composting worms are not earthworms. I ordered a pound of worms off the internet from the wormlady. http://wormlady.com/?page_id=3 They are called red wigglers...Eisenia foetida is the scientific name. I throw all my non-meat kitchen scraps in there: veggies, banana skins, coffee grounds, mashed potatoes, anything that is non meat. I water the bedding maybe once a week to keep it moist, but not too wet. Once the worms turn the scraps and even the bedding into castings, I move the "finished" castings to the right side and load fresh bedding on the left side, and bury my scraps in with the new bedding. The worms migrate to the left side where the food source is, leaving pure rich black worm castings on the right side. I remove these finished castings and store them and keep this cycle going all the time. The whole bin is raised on bricks and underneath I have a plastic container which catches the concentrated organic drippings from the process which is a highly concentrated "tea" which I feed to the plants as well. BTW none of this has any smell at all, and those worms can eat their body weight every day in scraps! Even the castings have no smell. This stuff is teeming with humates and fulvic acids and the castings are refined to a point where the nutrients they contain are readily and directly absorbed by the plant roots. The whole process is environmentally friendly too. There are lots of instructions for making worm bins on the net, but this works best for me...and my cannabis plants.