I built this DIY Planter Box few years back with pressure treated lumber and corrugated steel roof panels on the sides. Over the years we had many different vegetables grown in the planter box. I love how it looks and it holds a lot of dirt for vegetable plants with deep roots. Also, the box is at convenient height for taking care of the plants.
For more information on this Planter Box and to download printable PDF visit TheDIYPlan.