A worm farm is one of the easiest and most rewarding things a gardener can do for themselves, their garden, and their budget. Worms, (night-crawlers, red worms, etc.) are vital to the propagation of beautiful and nutritious soil for anything and everything you could want to grow. They are nature's little tillers and makers of high quality soil that will make everything in your garden, indoors or out, just thrive. Flowers bloom in glorious colour and plenty of vital nutrition gets to delivered into your fruits and veggies.
Setting up a worm garden is quite easy and inexpensive. The really easy method to having a worm farm is to order one from a reputable source. The best source I know of is
http://unclejimswormfarm.com/However, it is easy enough to make your own bins out of some of the big plastic tote type tubes with lids and a few items that pretty much are around most households. If you don't wish to buy worms then you can spend a little time digging up some of these worms out of your yard. Basic night crawler/red worm is the sort of worms you use for a worm farm. They can take coffee grounds, egg shells, used tea bags, fruit and veggie scrapes, old, used up dirt and dead plant material and turn it into some of the most beautiful soil in a matter of just a few days.
Best of all, once you got a good environment for your worms, they will thrive and breed like mad! Pretty soon you could have whole bins of beautiful soil to use anytime you need it. You'd never have to buy expensive potting soil again! All you need is a corner of a room and you can have a little soil factory.
First, decide how big you want your worm farm to be. Most people start out with a couple of containers as this makes it easier to move the worms to the other bin when it comes time to harvest the worm castings, or soil.
Drill, poke or cut several holes in the bottoms of each of your tubs for drainage and use a lid for the drain pan. (The liquid that drains from the worm beds is called worm tea...the best liquid fertilizer on the planet!) Put something at each corner of the drain-pan/lid to sit the worm bed/tub on top of and to allow drainage. (I used four large thread spools of the same size and affixed them with hot glue to each corner of the drain pan.) Make sure the tub sits firmly on the risers at each corner of the tub.
Now, lay down a layer of newspaper. Black ink, no colored pages! Then lay down a layer of soil a few inches thick. 2 or 4 inches is usually sufficient. DO NOT USE POTTING SOIL! Potting soil will kill your worms! Get cheap top soil as it has plenty of bits of wood and other organic material in it. One bag for a tub should work. Then add crunched up bits of egg shells, cold coffee grounds, (if you brew your coffee in unbleached coffee filters then the coffee filters are okay to tear up into the soil, but DO NOT ADD BLEACHED COFFEE FILTERS; they will kill your worms. Used tea bags are shredded open and the tea leaves dumped into the mix. Bits of lettuce leaves, carrot tops, celery leaves, potato peelings, etc. is good to add to the bin too. Do not add too much or else it'll be more than the worms can eat up fast enough to keep from stinking. NEVER ADD MEAT SCRAPES TO YOU BIN. Worms won't eat it and it'll go bad and contaminate the worm bin.
Mix everything together while misting clean water, (rain water is best), into the soil with a plant mister bottle. (DO NOT USE TAP WATER) Get the soil lightly moist but NOT wet. Introduce your worms into their new home and gently mix them into the first inch of soil. Cover top of bin with a piece of cloth. Burlap is best, but a piece of CLEAN, UNDYED, natural colored hemp or cotton cloth will work well enough. The cloth keeps light out and lets the air flow. Check a couple of times a week to turn, and mist, if needed.
When the worms have eaten most of the food you will need to harvest the soil because the worms can not live in their own castings. Either move the worms to another prepared bin as you harvest or else gently harvest while dropping worms back into the bin and adding more food/bedding to keep your worm farm going strong for many years.
The worms will breed and make more worms as time goes and you may find you need to harvest a few for going fishing, selling some to other fishermen, or putting them into different areas of your out door garden to help keep the soil nice and productive.