Once again, vertical gardening is rather self-explanatory (you plant vegetables vertically), and by planting upwards rather than outwards, space is maximised leaving more room for more nutritious foods to go. To create a vertical garden, a vertical structure must be installed – for example, a tree or a fence – which plants can climb up on, leaving space for other vegetables to grow underneath.
The sack and pit method is also recommended within vertical gardens, and need even less space, use water efficiently, have no soil erosion and are easily moveable. In the Rohingya Refugee camp, we work with people so they can grow sweet gourd (a type of long vegetable) which is a running or climbing vine. You do, of course, need a trellis for the vegetable to climb up onto.