A worm bin is like a farm with worms. You feed the worms and harvest their poop (called worm castings) to use as fertilizer for plants. Castings can also be used in a SIP. My worms are from Bill Shores who is Rick Bayless's gardener. I got half a pound of live Eisenia foetida, also known as red wriggler worms. This species are best for composting.
Here's how I made my worm farm...
Materials:
1/2 pound of red wriggler worms
Rectangular 10 gallon plastic bin or larger with lid
Drill with a 1/4 " drill bit
Ingredients for bedding:
Used potting mix, peat moss or coir which is coconut fiber to fill at least half the bin
Corrugated cardboard
Used coffee grounds
2 teaspoons of sand
Newspaper cut into thin 1/4" strips or put through a paper shredder. No glossy paper.
Water
with whatever material you use. I used 5 small blocks of coir.
office paper shredder. Do not use glossy paper.
a wrung out sponge.
the bin. Next soak the cardboard pieces till they are wet.
before feeding them. They should be fed once a week. My worms had
kale, a corn cob, beet stems and for dessert some red grapes!
to keep their home moist and so that flies don't lay eggs in their home.