To build a grow box, cut 30-inch-long boards, make the sides out of scrap wood, secure the box with wood glue, and drill drainage holes at the bottom. You need a 6-foot-by-1-inch-by-8-inch board and a 4-foot-by-1-inch-by-8-inch board to complete this project.
- Cut the boards
Use a circular saw to cut two 30-inch-long boards from the 6-foot-by-1-inch-by-8-inch board. Make the front and back portion of the box.
- Cut the box
Make a hole at the bottom of the box. Cut out a 30-inch piece from a 4-foot-by-1-inch-by-8-inch board. Position the bevel of the saw to 10 degrees. Make sure the board is cut 5 inches at the diameter.
- Make the sides
Use the remaining scraps to make the sides of the board. Cut the pieces to measure 5 7/8 inches on the top and 5 inches at the bottom.
- Assemble the pieces
Fit the pieces together, but avoid securing them. Cut away any edges, and sand away any rough spots.
- Secure the box
Apply clamps to the front, side and back of the box. Use wood glue to hold the pieces together. Allow the box to dry overnight.
- Drill drainage holes
Make holes at the bottom of the box. Space out the holes evenly.
- Decorate the box
Use stain or paint to decorate the completed grow box.