Air circulation is a must in and around the box. Type and Size of Box Commercial earthworm boxes are available through many garden supply catalogs. Homemade containers can be constructed from untreated wood or plastic. Use a shallow container with plenty of aeration holes. Never use a container which has been used for chemicals.
Plans are available through the Extension office.
The size of the box will depend upon the pounds of wastes. One square foot of surface area is needed for each pound of garbage buried each week. If your family generates a lot of waste, build a bigger box or build two small boxes. Keep in mind that smaller boxes are easier to move and empty. An average family of 4 generates 6 lbs. of kitchen waste per week.