The final step is attaching the supports that will go inside the box. I used 2x4 in the plans, but I had scrap 2x6 that I used on my planters. Really, any 2x material will work on this part, so put your scrap pile to use! Fit each support board in place flush with the base of the planter. Attach them with wood glue and 1.25” brad nails through the sides and into each 2x board.
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