Cut cedar picket fence to size based on your desired dimensions.
Apply wood glue on ends that will go together for additional support, then nail all of the corners to attach the wood pieces together.
Place a plastic liner inside the Planter Box for the dirt.
Attach decorative end pieces onto the corners of the planter box if desired.
Use a large drill bit to drill drainage holes through the plastic and the planter.
Add your favorite plants inside the planter box.