We knew we wanted to build planting boxes for our vegetable garden. Our zone 24 garden we builded the boxes out of recycled lumber. This time round for our Temecula zone 18 garden, we were inspired by Sunset Garden article How to build raised beds with scrap metal. Two pictures of inspirational garden below.
It was amazing how difficult it was to find salvage metal sheet at a reasonable price. What ended happening was we had planter made out of new steel plates at a cheaper price! The boxes had to have braces on the inside to keep its shape. Our planter boxes were of various sizes. We kept the width of the boxes to 4 ft wide so that we that we can reach the plants from both sides.