How to build a raised garden box and vertical trellis combo project is detailed in this step by step tutorial. One of those backyard projects is this great trellis and garden box combo. It will instantly become a huge focal point to any backyard garden. In no time the plants will start to climb and begin to cover the whole trellis. The DIY project shows that all the materials can be easily obtained and assembly is fairly easy even without a lot of skills being required.