Step 1 Measure and Cut Sides and Bottom Boards
Building a planter box is an easy project to do alone or with the family. Once you’ve determined the length of your planter, start by cutting deck boards for the sides and bottom of your planter. Your side and base panels should all be the same length. Then determine the height you’d like your planter. As an example, you can make your planter box two boards high, which would be the height of two deck boards pressed together at the edge.