In order to raise worms for worm composting (vermicomposting) you have to have a place to put the worms and the kitchen scraps. There are all kinds of composting bins that can be effective but they all work on the same idea. A box houses the worms, kitchen scraps, and bedding. As the worms eat they make their way through the box creating castings. If the composter is a tray system (like the examples in the pictures) the worms will finish in one tray then work their way into the next tray. The finished tray can then be cleaned out and the compost used in the garden or used to make compost tea. It's a pretty creative system. Simple and efficient!
The bins even have a valve at the bottom to let out the liquids. You can use that liquid to water plants.
So which of these choices will I pick?
The answer is none of the above! There's a cheaper way to do it that just takes a little assembly. Take a look here at Washington State University's Extension Service's instructions on how to build a homemade worm bin. I have a few ideas to add to my worm bin that I'll share as I begin the worm bin assembly process!
If you want more information about the worm compost bins above click on the pictures to see the details at Amazon.