While many serious vermicomposters prefer using custom-made wood vermicomposting bins, gardeners who are trying worm composting for the first time may prefer using a simpler and less expensive box. Plastic storage containers and bins are a great option that requires only a few modifications to become suitable for housing worms. They are also easy to clean and replace as you become more comfortable with worm composting.
Step 1: Choose a plastic storage container with a lid that will accommodate your particular family size. In general, you should plan on two square feet per family member to adequately house food scraps.
Step 2: Pick a plastic container that is about 12 inches deep. Avoid boxes that are too deep or too shallow for worm composting. If you cannot find a box that meets your square footage and depth requirements for vermicomposting, consider buying several smaller plastic bins.
Step 3: Drill ”¼ inch holes in the bottom of the plastic container to allow for drainage. Approximately 3 holes per square foot is a good rule of thumb for a worm composting box.
Step 4: Drill holes on each side of the plastic bin to encourage air circulation. Eight to ten holes for each side of an average sized worm bin should be enough.
Step 5: Place a piece of screen in the bottom of the bin to prevent the worm castings from dripping out of the box once you begin vermicomposting.
Step 6: Choose a bottom tray for the worm box that has a lip and can hold some water as well as the weight of the worm box.
Step 7: Find a place for your worm box that will not be exposed to extreme temperatures. Many gardeners have found success vermicomposting in garages or basements. A well-kept vermicomposting box may also be kept in a larger kitchen.
Step 8 : Raise the worm box above the tray at least an inch to encourage good drainage. Try using a few bricks for this step.
Step 9: Fill the worm box and place the plastic container’s lid onto the top of the box. There is no need to drill holes in the lid if you have adequately perforated the worm box.