How to Build a Large Worm Bin

Stand the two 11-by-12-inch boards resting on their 12-inch sides and hold them 2 feet apart. Stand two of the 12-by-24-inch boards, also on their 12-inch sides, and place them perpendicular to the 11-inch boards to form a rectangle.

Make the corners of the box flush and screw through the 24-inch boards and into the ends of the 11-inch boards using three evenly spaced screws at each corner. Stand the 3-by-3-inch boards upright and place one along each inside corner of the box. Screw through the bin and into the 3-by-3 supports to hold them in place.

Spread the three remaining 3-by-3 boards out parallel to one another spaced one foot apart. Lay a 12-by-24 piece of plywood over the three boards. Screw three evenly spaced screws through the plywood and into each 3-by-3 board below to form the bottom of the bin.

Flip the bottom piece so the 3-by-3 boards are facing up and set it on top of your constructed bin. Align the edges on all four sides. Insert a screw every 6 inches through the bottom board and into the bin all around.

Turn the bin upside down. Drill six holes into the bottom of the bin and four holes into each side for drainage and aeration. Lay your screening down into the bottom of the box. Place your box in a convenient location and use the last piece of plywood as your lid.

Tear strips of newspaper and wet them lightly to make them damp. Place one strip of paper into the bin at a time to create fluffy worm bedding. Use enough paper to fill a third to a half of the bin with plenty of space between the strips.

Sprinkle two cups of coffee grounds or sand over the newspaper. Add your worms gently to the bin and close the lid loosely to let them adjust for a week. Feed the worms with four cups of kitchen scraps every week for one month. Add scraps daily as they are made after the first month to keep the hungry and reproducing worms going.