Vertical Gardens The Do It Yourself Step-By-Step Vertical Garden Playbook Vertical gardening is one of the most popular trends currently in home gardening. I first discovered it looking at pins on Pinterest, and I was immediately intrigued by the idea. When I started doing research, I discovered that vertical gardening means different things to different people. It can mean an outdoor vegetable garden where vining or sprawling plants are trained to grow up a trellis or other vertical structure. Or, it can mean growing plants in containers attached to an outdoor wall or other structure. Finally, it can mean growing plants in containers on a wall indoors. We will take a look at each of these types of gardens.